Re: [Drakelist] Nastiest Drake Gear

[Ron]

Looks like it has been washedin hurricane flood waters.

73,
Ron WD8SBB

--- On Wed, 12/21/11, John Hudson john.hud...@calema.ca.gov wrote:

 From: John Hudson john.hud...@calema.ca.gov
 Subject: Re: [Drakelist] Nastiest Drake Gear
 To: John Brown brown...@optusnet.com.au, 'Steve Wedge' 
 w1es1...@earthlink.net, drakelist@zerobeat.net drakelist@zerobeat.net
 Date: Wednesday, December 21, 2011, 7:42 PM
 Do I dare say, well Hewlett Packard
 use to wash. . . . .
 
 ;-)
 
 
 -Original Message-
 From: drakelist-boun...@zerobeat.net
 [mailto:drakelist-boun...@zerobeat.net]
 On Behalf Of John Brown
 Sent: Wednesday, December 21, 2011 4:32 PM
 To: 'Steve Wedge'; drakelist@zerobeat.net
 Subject: Re: [Drakelist] Nastiest Drake Gear
 
 NahI think it will come up pretty well.
 JB
 
 -Original Message-
 From: drakelist-boun...@zerobeat.net
 [mailto:drakelist-boun...@zerobeat.net]
 On Behalf Of Steve Wedge
 Sent: Wednesday, 21 December 2011 11:46 PM
 To: drakelist@zerobeat.net
 Subject: [Drakelist] Nastiest Drake Gear
 
 I'm going to nominate this as the most-abused,
 nastiest-looking piece of
 Drake gear I've ever seen:
 
 http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItemitem=260919992177ssPageNa
 me=ADME:B:SS:US:1123
 
 I wouldn't even bet that the meter's working given how much
 moisture this
 one has seen.
 
 Enjoy those Drakes - but not underwater...
 
 Steve, W1ES/4
 
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Re: [Drakelist] Nastiest Drake Gear

[Curt Nixon]

I like the real slow crush from a concrete compression test machineI 
think Letterman did a bowling ball once that then exploded.  Pretty cool.


Curt..the other Curt

KU8L

On 12/21/2011 9:10 PM, Mark Nace wrote:
This is a bad thought, but we have all seen the big crushers for wrecked cars. 
I wonder if a little crusher exists for radio hulks like this. 


Mark
N5KAE



- Original Message 

From: Steve Wedgew1es1...@earthlink.net
To: leepulsa...@embarqmail.com; John Brownbrown...@optusnet.com.au;
drakelist@zerobeat.net
Sent: Wed, December 21, 2011 7:53:31 PM
Subject: Re: [Drakelist] Nastiest Drake Gear

Two people have bid on it, I see.

Could it be one of you?

On one level, it would be interesting to see if someone could get it to work at
all.  After all, pseudo-antique shops are making the Big Bux selling Shabby
Chic these days and using furniture with distressed paint, etc.

Then again, someone could make a mobile out of it.  Would it then be a mobile
rig?

Ducking...

Steve Wedge, W1ES/4

I swear by my life, and my love of it, that I will never live for the sake of
another man, nor ask another man to live for mine.
-Ayn Rand.

All my computers have my signature with various pearls of wisdom appended
thereto.


--
From: leepulsa...@embarqmail.com
Sent: Wednesday, December 21, 2011 8:27 PM
To: John Brownbrown...@optusnet.com.au; 'Steve Wedge'
w1es1...@earthlink.net;drakelist@zerobeat.net
Subject: Re: [Drakelist] Nastiest Drake Gear


In a few days you will find someone on here asking how do you remove rust and

make a cabinet and chassis look like new again.  What brand of stuff in a bottle
will do this in 5 minutes or less.  Then they will add, please, no suggestions
costing over $10.00 !  You just watch and see if I am correct.

Lee, w0vt


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Re: [Drakelist] Nastiest Drake Gear

[Gypsymt34]

In a message dated 12/21/2011 11:48:39 P.M. Eastern Standard Time,  
w...@roadrunner.com writes:

First  remove the crystals. They occasionally fail and are needed.
Wailll, I think the PTO should come out of there too, and then of course  
someone will say the relay, and oh yeah the light bulb circuit  breaker.
Carl wd8nhk
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Re: [Drakelist] AC-4R Surprise

[Steve Wedge]

True.

I've seen 3-500Z's die that way, too, but that failure is usually a lot more 
exciting!  You won't find a short with the ohmmeter, but you'll get a nice bang 
when you put the 3kV to the plate :)

Steve, W1ES/4

-Original Message-
From: Garey Barrell k4...@mindspring.com
Sent: Dec 21, 2011 10:11 PM
To: Steve Wedge w1es1...@earthlink.net
Cc: Drakelist@zerobeat.net
Subject: Re: [Drakelist] AC-4R Surprise

Steve -

Extremely high gain tubes mean extremely closely spaced grids! :-)

--
73, Garey - K4OAH
St Charles, IL

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com


Steve Wedge wrote:
 If you can find a tube tester, test it.  I find that 6HS6's get shorts more 
 than most other 
 tubes.  They won't show up until you light the filament.  My TV-10-D/U puts 
 line voltage on the 
 pins to check for shorts (to light a neon bulb), so you wouldn't necessarily 
 see a short with no 
 power to it.  Not sure why I see so many: if it's something in the design or 
 just because many 
 people when they find these tubes are on the way out try to milk them for as 
 long as they can 
 because they're so expensive.


 From: rhule...@comcast.net
 Sent: Wednesday, December 21, 2011 8:54 PM
 To: Drakelist@zerobeat.net
 Cc: Drakelist@zerobeat.net
 Subject: Re: [Drakelist] AC-4R Surprise

 Well, my nose detected burnt smell in vicinity of T4.  R61, a 150ohm 1/2 
 resistor in the 250 volt 
 line to V8's plate is burnt to a crisp, resistance is zero.  But why?  
 Resistance to ground on V8 
 pin 5 is 15k per spec.  But pin 6 screen grid resistance to ground it 15k, 
 vs 90k spec.

 Any advice?  73, Curt KB5JO




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Re: [Drakelist] T4XB Front Panel

[Steve Wedge]

I've got an extra one, but you know it has that same darned hole in it ;-)
Steve, W1ES/4
-Original Message- From: Pete Juliano Sent: Dec 21, 2011 11:49 PM To: Drakelist@zerobeat.net Subject: [Drakelist] T4XB Front Panel 
Does any one happen to have a T4XB front panel for sale? It doesn't have to be museum quality but no extra holes please.

Please email me direct with your info and asking price --a digital photo would be helpful too.

73's
Pete N6QW

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Re: [Drakelist] Nastiest Drake

[Gypsymt34]

Hi All, 
Well I see that upay has it at $20, someone wanted for parts.  If  it was 
at a ham flea market I'd probably be idiotic enough to buy it for that  too, 
but darned if I would pay 2x ,  shipping on top.  Carl  wd8nhk___
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Re: [Drakelist] AC-4R Surprise

[kc9cdt]

Does the glass envelope actually break?
73,
Lee



-Original Message-
From: Steve Wedge w1es1...@earthlink.net
To: k4oah k4...@mindspring.com
Cc: Drakelist Drakelist@zerobeat.net
Sent: Thu, Dec 22, 2011 8:42 am
Subject: Re: [Drakelist] AC-4R Surprise


True.

I've seen 3-500Z's die that way, too, but that failure is usually a lot 
more
exciting!  You won't find a short with the ohmmeter, but you'll get a 
nice bang

when you put the 3kV to the plate :)

Steve, W1ES/4

-Original Message-

From: Garey Barrell k4...@mindspring.com
Sent: Dec 21, 2011 10:11 PM
To: Steve Wedge w1es1...@earthlink.net
Cc: Drakelist@zerobeat.net
Subject: Re: [Drakelist] AC-4R Surprise

Steve -

Extremely high gain tubes mean extremely closely spaced grids! :-)

--
73, Garey - K4OAH
St Charles, IL

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com


Steve Wedge wrote:
If you can find a tube tester, test it.  I find that 6HS6's get 

shorts more
than most other
tubes.  They won't show up until you light the filament.  My 

TV-10-D/U puts
line voltage on the
pins to check for shorts (to light a neon bulb), so you wouldn't 

necessarily
see a short with no
power to it.  Not sure why I see so many: if it's something in the 

design or
just because many
people when they find these tubes are on the way out try to milk 

them for as
long as they can

because they're so expensive.


From: rhule...@comcast.net
Sent: Wednesday, December 21, 2011 8:54 PM
To: Drakelist@zerobeat.net
Cc: Drakelist@zerobeat.net
Subject: Re: [Drakelist] AC-4R Surprise

Well, my nose detected burnt smell in vicinity of T4.  R61, a 

150ohm 1/2
resistor in the 250 volt
line to V8's plate is burnt to a crisp, resistance is zero.  But 

why?
Resistance to ground on V8
pin 5 is 15k per spec.  But pin 6 screen grid resistance to ground 

it 15k,
vs 90k spec.


Any advice?  73, Curt KB5JO






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Re: [Drakelist] AC-4R Surprise

[Steve Wedge]

No, but all such failures I'd seen were in Heathkit SB-220's.  When the short 
occurs, it causes immediate and catastrophic flameage of the grid RF choke.  
Because those chokes usually have some sort of waxy coating, they make nice 
candles :)  The smoke will fill the room quickly.

-Original Message-
From: kc9...@aol.com
Sent: Dec 22, 2011 11:49 AM
To: w1es1...@earthlink.net, k4...@mindspring.com
Cc: Drakelist@zerobeat.net
Subject: Re: [Drakelist] AC-4R Surprise

Does the glass envelope actually break?
73,
Lee



-Original Message-
From: Steve Wedge w1es1...@earthlink.net
To: k4oah k4...@mindspring.com
Cc: Drakelist Drakelist@zerobeat.net
Sent: Thu, Dec 22, 2011 8:42 am
Subject: Re: [Drakelist] AC-4R Surprise


True.

I've seen 3-500Z's die that way, too, but that failure is usually a lot 
more
exciting!  You won't find a short with the ohmmeter, but you'll get a 
nice bang
when you put the 3kV to the plate :)

Steve, W1ES/4

-Original Message-
From: Garey Barrell k4...@mindspring.com
Sent: Dec 21, 2011 10:11 PM
To: Steve Wedge w1es1...@earthlink.net
Cc: Drakelist@zerobeat.net
Subject: Re: [Drakelist] AC-4R Surprise

Steve -

Extremely high gain tubes mean extremely closely spaced grids! :-)

--
73, Garey - K4OAH
St Charles, IL

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com


Steve Wedge wrote:
 If you can find a tube tester, test it.  I find that 6HS6's get 
shorts more
than most other
 tubes.  They won't show up until you light the filament.  My 
TV-10-D/U puts
line voltage on the
 pins to check for shorts (to light a neon bulb), so you wouldn't 
necessarily
see a short with no
 power to it.  Not sure why I see so many: if it's something in the 
design or
just because many
 people when they find these tubes are on the way out try to milk 
them for as
long as they can
 because they're so expensive.


 From: rhule...@comcast.net
 Sent: Wednesday, December 21, 2011 8:54 PM
 To: Drakelist@zerobeat.net
 Cc: Drakelist@zerobeat.net
 Subject: Re: [Drakelist] AC-4R Surprise

 Well, my nose detected burnt smell in vicinity of T4.  R61, a 
150ohm 1/2
resistor in the 250 volt
 line to V8's plate is burnt to a crisp, resistance is zero.  But 
why?
Resistance to ground on V8
 pin 5 is 15k per spec.  But pin 6 screen grid resistance to ground 
it 15k,
vs 90k spec.

 Any advice?  73, Curt KB5JO




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[Drakelist] Speaking of breaking Glass...

[Curt]

I witnessed something recently that In nearly 50 years of working with 
tube rigs, I had never seen.


I was working on an older hybrid rig with 6JS6's in it.  Had a known 
good set of finals and was getting unit ready to ship to a new owner.


Powered it on the bench and all was good..did a cold 
neutralization...then reconnected filaments and powered up.


Its sitting there at idle and I start hearing tink..tink...tink... 
like tubes getting hot.  I look into the final cage and see both tubes 
filaments on.  sits there some more..and I start smelling it HOT.  Look 
again and one tube is bright red plate.  Just as I reach and cut the 
power, I heard some arcing.


Very strange I thought since it had all been working fine.

So I open it all up and check out everything.  All looks ok EXCEPT..the 
one tube that was bright has a small suck-hole thru the side of it.  It 
got so hot, the glass melted and a hole was sucked thru the side without 
breaking the rest of the tube.  YIKES


So, smart fellow that I am, I'm thinking bad tube right?.  Just to be 
sure, I double check the bias supply right at the sockets..looks ok.  
All else seems fine.  Double checked the driver plate coupling cap since 
that can put b+ on the grids of the finals if it shorts..OK..it would 
have smoked both tubes anyway.


So..bad tube..  So I put back in a back-up set of finals..about 80% on 
10M pair.   Power on, quick  set bias V , watch plate current,  all 
good.tink tink tink..AWE CRAPP!...power off.  Same tube 
position is COOKING hot.  What the


So..smart fellow that I am, I plug in the bad tube and check the 
resistance between the tube pin above the socket to the bias 
bus...OPEN!   Unbelievable...the grid pin connection in the tube socket 
had been opened up to the point that it no longer contacted the pin on 
the tube.  Wide open throttle on one tube...even in standbyso no 
indication on the multi-purpose, plate meter.


Quick correction of the socket...a quick look at all the empty shelf 
space where the expensive spare finals used to be stored...and the rig 
is ready to ship..


Life is an expedition...

Happy Holidays and controlled bias to all.

Curt
KU8L

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Re: [Drakelist] Speaking of breaking Glass...

[Eddy Swynar]

On 2011-12-22, at 12:54 PM, Curt wrote:

 All looks ok EXCEPT..the one tube that was bright has a small suck-hole thru 
 the side of it.  It got so hot, the glass melted and a hole was sucked thru 
 the side without breaking the rest of the tube.  YIKES

Hi Curt,

That happened to me one time here, too, only the circumstances were a bit 
different...

I had a brand new pair of 811A tubes in my 500-watt amplifier,  had just 
purchased a Yaesu FT-980. I got so enamoured with my being able to ...raise 
the average talk power of my SSB signal by virtue of the new rig's speech 
processor that after about 5, or so, DX QSOs on 20-meters, the fuse in the 
amp's power supply popped. I replaced it with a new one, and again, it blew...

So I took off the amplifier's covert  examined the new tubes...and lo  
behold, there was a tiny pin hole in the envelope of one. I guess my speech 
processor raised the plate dissipation of those jugs as well as my ...average 
talk power, to the point that the one tube got so hot the glass had softened, 
 the vacuum was sucked out!

I've never used a speech processor since that time.

~73~ de Eddy VE3CUI - VE3XZ___
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Re: [Drakelist] Speaking of breaking Glass...

[Richard Knoppow]

- Original Message - 
From: Eddy Swynar deswy...@xplornet.ca

To: Curt cptc...@flash.net
Cc: drakelist@zerobeat.net
Sent: Thursday, December 22, 2011 10:08 AM
Subject: Re: [Drakelist] Speaking of breaking Glass...



On 2011-12-22, at 12:54 PM, Curt wrote:

All looks ok EXCEPT..the one tube that was bright has a 
small suck-hole thru the side of it.  It got so hot, the 
glass melted and a hole was sucked thru the side without 
breaking the rest of the tube.  YIKES


Hi Curt,

That happened to me one time here, too, only the 
circumstances were a bit different...


I had a brand new pair of 811A tubes in my 500-watt 
amplifier,  had just purchased a Yaesu FT-980. I got so 
enamoured with my being able to ...raise the average talk 
power of my SSB signal by virtue of the new rig's speech 
processor that after about 5, or so, DX QSOs on 20-meters, 
the fuse in the amp's power supply popped. I replaced it 
with a new one, and again, it blew...


So I took off the amplifier's covert  examined the new 
tubes...and lo  behold, there was a tiny pin hole in the 
envelope of one. I guess my speech processor raised the 
plate dissipation of those jugs as well as my ...average 
talk power, to the point that the one tube got so hot the 
glass had softened,  the vacuum was sucked out!


I've never used a speech processor since that time.

~73~ de Eddy VE3CUI - VE3XZ
   Eimac featured this effect when they began selling 
ceramic tubes. They showed a picture of a glass tube with a 
suck-hole in the side and a ceramic operated under the same 
conditions that did not. I think they said the suck hole was 
the result of electron bombardment of the tube at high 
frequencies but its possible that any inclusion or weak spot 
in the glass could do it. I've had tubes crack from 
overheating but have never had a suck-out.





--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com


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Re: [Drakelist] AC-4R Surprise

[rhulett1]

All,

Well my luck or lack thereof continues...  I pulled the 6HS6 and then 
referenced my Eico 625.  Of course the 6HS6 isn't mentioned anywhere in any of 
the charts I have.  So, based on some results of a search, tested it as a 6AU6 
and then a 6HR6.  Former showed good, latter showed marginal, neither 
showed short.

So, I guess r61 failed sometime in the past but not the cause of the power 
supply going south.  At least I don't need to try finding another 6HS6, my 
usual source for tubes shows 6HS6 out of stock.

I'm certainly old enough to know better, but suppose will just keep checking 
tubes as a start while I have the tester out of the cabinet and on the desk.

73, Curt KB5JO

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Re: [Drakelist] Speaking of breaking Glass...

[Steve Wedge]

Couldn't have happened to something with 6146's - would have not been expensive 
enough ;-)

At least you found it.  That's when stuff starts getting expensive.

A lot of times, when an SB-220 would get a parasitic, that grid choke would get 
zorched.  By the time that choke opened up, the grid was usually a goner and 
would short to the plate.  I'd always have to sacrifice one 30 ohm resistor to 
test and make sure the tube was truly now just a lamp base and have to say that 
it was 100% of the time.

Lots of controversy about AG6K and his suppressors.  I've talked to the guy at 
length and he's not making a killing on those kits.  He's very self-assured, 
but the stuff I've read tells me that he has reason to be.  I saw loads of 
SB-220's with fried chokes, pitted tuning caps, fried relays and bandswitches 
and knew these were not all due to cockpit error.  I even did a TL-922 with 
that kit once.  You think the Heath parts were expensive...

W1ES

-Original Message-
From: Curt cptc...@flash.net
Sent: Dec 22, 2011 12:54 PM
To: drakelist@zerobeat.net
Subject: [Drakelist] Speaking of breaking Glass...

I witnessed something recently that In nearly 50 years of working with 
tube rigs, I had never seen.

I was working on an older hybrid rig with 6JS6's in it.  Had a known 
good set of finals and was getting unit ready to ship to a new owner.

Powered it on the bench and all was good..did a cold 
neutralization...then reconnected filaments and powered up.

Its sitting there at idle and I start hearing tink..tink...tink... 
like tubes getting hot.  I look into the final cage and see both tubes 
filaments on.  sits there some more..and I start smelling it HOT.  Look 
again and one tube is bright red plate.  Just as I reach and cut the 
power, I heard some arcing.

Very strange I thought since it had all been working fine.

So I open it all up and check out everything.  All looks ok EXCEPT..the 
one tube that was bright has a small suck-hole thru the side of it.  It 
got so hot, the glass melted and a hole was sucked thru the side without 
breaking the rest of the tube.  YIKES

So, smart fellow that I am, I'm thinking bad tube right?.  Just to be 
sure, I double check the bias supply right at the sockets..looks ok.  
All else seems fine.  Double checked the driver plate coupling cap since 
that can put b+ on the grids of the finals if it shorts..OK..it would 
have smoked both tubes anyway.

So..bad tube..  So I put back in a back-up set of finals..about 80% on 
10M pair.   Power on, quick  set bias V , watch plate current,  all 
good.tink tink tink..AWE CRAPP!...power off.  Same tube 
position is COOKING hot.  What the

So..smart fellow that I am, I plug in the bad tube and check the 
resistance between the tube pin above the socket to the bias 
bus...OPEN!   Unbelievable...the grid pin connection in the tube socket 
had been opened up to the point that it no longer contacted the pin on 
the tube.  Wide open throttle on one tube...even in standbyso no 
indication on the multi-purpose, plate meter.

Quick correction of the socket...a quick look at all the empty shelf 
space where the expensive spare finals used to be stored...and the rig 
is ready to ship..

Life is an expedition...

Happy Holidays and controlled bias to all.

Curt
KU8L

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Re: [Drakelist] Speaking of breaking Glass...

[Steve Wedge]

Have never experienced this and hope I never do.  These sweep tubes are getting 
too precious.

3-500's have much thicker glass than even 811A's, so I don't think it would be 
very easy to get a suck-out on one of those puppies.

I have seen the grid get shorted to the plate - usually as a result of an 
initial parasitic oscillation in the tube.  I've repaired lots of SB-220's and 
the problem is fairly common in them.  I've never heard of an L-4 or L-4B 
failing like this...

Steve, W1ES/4



-Original Message-
From: Richard Knoppow 1oldle...@ix.netcom.com
Sent: Dec 22, 2011 1:26 PM
To: Eddy Swynar deswy...@xplornet.ca, Curt cptc...@flash.net
Cc: drakelist@zerobeat.net
Subject: Re: [Drakelist] Speaking of breaking Glass...


- Original Message - 
From: Eddy Swynar deswy...@xplornet.ca
To: Curt cptc...@flash.net
Cc: drakelist@zerobeat.net
Sent: Thursday, December 22, 2011 10:08 AM
Subject: Re: [Drakelist] Speaking of breaking Glass...



On 2011-12-22, at 12:54 PM, Curt wrote:

 All looks ok EXCEPT..the one tube that was bright has a 
 small suck-hole thru the side of it.  It got so hot, the 
 glass melted and a hole was sucked thru the side without 
 breaking the rest of the tube.  YIKES

Hi Curt,

That happened to me one time here, too, only the 
circumstances were a bit different...

I had a brand new pair of 811A tubes in my 500-watt 
amplifier,  had just purchased a Yaesu FT-980. I got so 
enamoured with my being able to ...raise the average talk 
power of my SSB signal by virtue of the new rig's speech 
processor that after about 5, or so, DX QSOs on 20-meters, 
the fuse in the amp's power supply popped. I replaced it 
with a new one, and again, it blew...

So I took off the amplifier's covert  examined the new 
tubes...and lo  behold, there was a tiny pin hole in the 
envelope of one. I guess my speech processor raised the 
plate dissipation of those jugs as well as my ...average 
talk power, to the point that the one tube got so hot the 
glass had softened,  the vacuum was sucked out!

I've never used a speech processor since that time.

~73~ de Eddy VE3CUI - VE3XZ
Eimac featured this effect when they began selling 
ceramic tubes. They showed a picture of a glass tube with a 
suck-hole in the side and a ceramic operated under the same 
conditions that did not. I think they said the suck hole was 
the result of electron bombardment of the tube at high 
frequencies but its possible that any inclusion or weak spot 
in the glass could do it. I've had tubes crack from 
overheating but have never had a suck-out.




--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com


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Re: [Drakelist] AC-4R Surprise

[Robert Ladden]

I still believe that R61 and the AC-4 were both victims of the same failure. 
And I still would not trust that 6HS6. Did you recheck the resistances with the 
6HS6 removed?

73,
Bob WW3QB



 
 All,

Well my luck or lack thereof continues...  I pulled the 6HS6 and then 
referenced my Eico 625.  Of course the 6HS6 isn't mentioned anywhere in any of 
the charts I have.  So, based on some results of a search, tested it as a 6AU6 
and then a 6HR6.  Former showed good, latter showed marginal, neither 
showed short.

So, I guess r61 failed sometime in the past but not the cause of the power 
supply going south.  At least I don't need to try finding another 6HS6, my 
usual source for tubes shows 6HS6 out of stock.

I'm certainly old enough to know better, but suppose will just keep checking 
tubes as a start while I have the tester out of the cabinet and on the desk.

73, Curt KB5JO

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Re: [Drakelist] AC-4R Surprise

[Steve Wedge]

I think Garey had mentioned you can fry the plate resistor on V8 if you short 
one of the trimmer caps while tuning it.

It's still odd to me to have a resistor fail shorted.

The 6HS6 will have the same switch settings as a 6AU6 but it has quite a bit 
more gain and a different bias setting.

TV-10 D/U settings are:
tube fil vswitches  biasshunt scale   buttonmin reading

6HS66.3 JR3-567212  --- D   P3  3000
6AU66.3 JR3-567210  --- D   P3  2050

The 6HS6 has quite a bit more gain (these are minimum, and I remember seeing 
4200 from typical new ones).

Good luck.

Steve, W1ES/4


-Original Message-
From: rhule...@comcast.net
Sent: Dec 22, 2011 1:33 PM
To: Steve Wedge w1es1...@earthlink.net
Cc: Drakelist@zerobeat.net, kc9...@aol.com, k4...@mindspring.com
Subject: Re: [Drakelist] AC-4R Surprise

All,

Well my luck or lack thereof continues...  I pulled the 6HS6 and then 
referenced my Eico 625.  Of course the 6HS6 isn't mentioned anywhere in any of 
the charts I have.  So, based on some results of a search, tested it as a 6AU6 
and then a 6HR6.  Former showed good, latter showed marginal, neither 
showed short.

So, I guess r61 failed sometime in the past but not the cause of the power 
supply going south.  At least I don't need to try finding another 6HS6, my 
usual source for tubes shows 6HS6 out of stock.

I'm certainly old enough to know better, but suppose will just keep checking 
tubes as a start while I have the tester out of the cabinet and on the desk.

73, Curt KB5JO


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Re: [Drakelist] AC-4R Surprise

[Steve Wedge]

I think Garey had mentioned you can fry the plate resistor on V8 if you short 
one of the trimmer caps while tuning it.

It's still odd to me to have a resistor fail shorted.

The 6HS6 will have the same switch settings as a 6AU6 but it has quite a bit 
more gain and a different bias setting.

TV-10 D/U settings are:
tube fil vswitches  biasshunt scale   buttonmin reading

6HS66.3 JR3-567212  --- D   P3  3000
6AU66.3 JR3-567210  --- D   P3  2050

The 6HS6 has quite a bit more gain (these are minimum, and I remember seeing 
4200 from typical new ones).

Good luck.

Steve, W1ES/4


-Original Message-
From: rhule...@comcast.net
Sent: Dec 22, 2011 1:33 PM
To: Steve Wedge w1es1...@earthlink.net
Cc: Drakelist@zerobeat.net, kc9...@aol.com, k4...@mindspring.com
Subject: Re: [Drakelist] AC-4R Surprise

All,

Well my luck or lack thereof continues...  I pulled the 6HS6 and then 
referenced my Eico 625.  Of course the 6HS6 isn't mentioned anywhere in any of 
the charts I have.  So, based on some results of a search, tested it as a 6AU6 
and then a 6HR6.  Former showed good, latter showed marginal, neither 
showed short.

So, I guess r61 failed sometime in the past but not the cause of the power 
supply going south.  At least I don't need to try finding another 6HS6, my 
usual source for tubes shows 6HS6 out of stock.

I'm certainly old enough to know better, but suppose will just keep checking 
tubes as a start while I have the tester out of the cabinet and on the desk.

73, Curt KB5JO


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Re: [Drakelist] AC-4R Surprise

[Garey Barrell]

Steve -

The resistor in question is a 150 ohm decoupling resistor, not a plate load resistor.  It's not all 
that unusual for the low value carbon comps to fail shorted.  Enough current to melt the binder into 
a lump of coal ('tis the Season) rather than enough to just vaporize it!  Also an indication of 
'some', not 'catastrophic' overload.


By the way, the reason for the wildly out of range Pin to chassis resistance is sometimes a matter 
of ohmmeter polarity, need to check both ways.  The other problem is that Drake was not consistent 
in changing the Resistance and Voltage charts to reflect schematic changes.


--
73, Garey - K4OAH
St Charles, IL

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com


Steve Wedge wrote:

I think Garey had mentioned you can fry the plate resistor on V8 if you short 
one of the trimmer caps while tuning it.

It's still odd to me to have a resistor fail shorted.

The 6HS6 will have the same switch settings as a 6AU6 but it has quite a bit 
more gain and a different bias setting.

TV-10 D/U settings are:
tube fil vswitches  biasshunt scale   buttonmin reading

6HS66.3 JR3-567212  --- D   P3  3000
6AU66.3 JR3-567210  --- D   P3  2050

The 6HS6 has quite a bit more gain (these are minimum, and I remember seeing 
4200 from typical new ones).

Good luck.

Steve, W1ES/4


-Original Message-

From: rhule...@comcast.net
Sent: Dec 22, 2011 1:33 PM
To: Steve Wedgew1es1...@earthlink.net
Cc: Drakelist@zerobeat.net, kc9...@aol.com, k4...@mindspring.com
Subject: Re: [Drakelist] AC-4R Surprise

All,

Well my luck or lack thereof continues...  I pulled the 6HS6 and then referenced my Eico 625.  Of course 
the 6HS6 isn't mentioned anywhere in any of the charts I have.  So, based on some results of a search, tested it as a 
6AU6 and then a 6HR6.  Former showed good, latter showed marginal, neither showed 
short.

So, I guess r61 failed sometime in the past but not the cause of the power supply going 
south.  At least I don't need to try finding another 6HS6, my usual source for tubes 
shows 6HS6 out of stock.

I'm certainly old enough to know better, but suppose will just keep checking 
tubes as a start while I have the tester out of the cabinet and on the desk.

73, Curt KB5JO




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Re: [Drakelist] AC-4R Surprise

[rhulett1]

I've checked all of the tubes with my old emission tester, all test good 
except for the OA2 which lights up but tests bad.  Not sure how valid that is.

And with V8 removed, the resistance at pin 6 is still 15k rather than 90k per 
the manual. I'm in process of resistance checking the rest of the tubes.

Sorry for the stream of consciousness dialog about this, I'll let all know if 
the cause of resistors opening in the power supply and shorting in the rig is 
ever found.

73, Curt KB5JO

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Re: [Drakelist] AC-4R Surprise

[Steve Wedge]

At 55, I still learn stuff.  I consider that to be cool.

Garey, I'd be willing to bet you've worked on a lot more tube gear than I 
have, so this will go into my mental filing cabinet as a failure mode.  Caps 
I've seen fail shorted; diodes and transistors, too.


Given what you've said about an overloaded resistor failing shorted, I'd 
ditch the 6HS6 or at least set it aside until you can test it properly. 
Again, I still maintain that we see even more failures of these than usual 
because of previous owners milking them due to their high price.  I've even 
repaired one R-4B that had a 6AU6 subbed into V8.  It was working, but I'd 
bet under extreme conditions it would have made its presence known!


Curt, if you can't find a 6HS6 locally, you can sub a 6AU6 into V2 of the 
R-4B temporarily so you can borrow the 6HS6 for the T-4X premixer.  You'll 
have reduced sensitivity.  Let me know if you're still looking for a 6HS6 
and I can call my local guy and he'll scare one up.



Steve Wedge, W1ES/4

I swear by my life, and my love of it, that I will never live for the sake 
of another man, nor ask another man to live for mine.

-Ayn Rand.

All my computers have my signature with various pearls of wisdom appended 
thereto.



--
From: Garey Barrell k4...@mindspring.com
Sent: Thursday, December 22, 2011 3:41 PM
To: Steve Wedge w1es1...@earthlink.net
Cc: rhule...@comcast.net; Drakelist@zerobeat.net; kc9...@aol.com
Subject: Re: [Drakelist] AC-4R Surprise


Steve -

The resistor in question is a 150 ohm decoupling resistor, not a plate 
load resistor.  It's not all that unusual for the low value carbon comps 
to fail shorted.  Enough current to melt the binder into a lump of coal 
('tis the Season) rather than enough to just vaporize it!  Also an 
indication of 'some', not 'catastrophic' overload.


By the way, the reason for the wildly out of range Pin to chassis 
resistance is sometimes a matter of ohmmeter polarity, need to check both 
ways.  The other problem is that Drake was not consistent in changing the 
Resistance and Voltage charts to reflect schematic changes.


--
73, Garey - K4OAH
St Charles, IL

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com


Steve Wedge wrote:
I think Garey had mentioned you can fry the plate resistor on V8 if you 
short one of the trimmer caps while tuning it.


It's still odd to me to have a resistor fail shorted.

The 6HS6 will have the same switch settings as a 6AU6 but it has quite a 
bit more gain and a different bias setting.


TV-10 D/U settings are:
tube fil vswitches  biasshunt scale   buttonmin 
reading


6HS6 6.3 JR3-5672 12 --- D P3 3000 6AU6 6.3 JR3-5672 10 --- D P3 2050

The 6HS6 has quite a bit more gain (these are minimum, and I remember 
seeing 4200 from typical new ones).


Good luck.

Steve, W1ES/4


-Original Message-

From: rhule...@comcast.net
Sent: Dec 22, 2011 1:33 PM
To: Steve Wedgew1es1...@earthlink.net
Cc: Drakelist@zerobeat.net, kc9...@aol.com, k4...@mindspring.com
Subject: Re: [Drakelist] AC-4R Surprise

All,

Well my luck or lack thereof continues...  I pulled the 6HS6 and then 
referenced my Eico 625.  Of course the 6HS6 isn't mentioned anywhere in 
any of the charts I have.  So, based on some results of a search, tested 
it as a 6AU6 and then a 6HR6.  Former showed good, latter showed 
marginal, neither showed short.


So, I guess r61 failed sometime in the past but not the cause of the 
power supply going south.  At least I don't need to try finding another 
6HS6, my usual source for tubes shows 6HS6 out of stock.


I'm certainly old enough to know better, but suppose will just keep 
checking tubes as a start while I have the tester out of the cabinet and 
on the desk.


73, Curt KB5JO




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Re: [Drakelist] TX-4C 160 Mod ?

[Ron]

I've also had some questions about the FS4 project of this page.  I actually 
had good fortune to find and e-mail Mr Robert Stein.  Although I cannot locate 
the e-mails, I recall mentioning two issues with the project.  First issue is 
critical parts no longer available and no good subs.  Second and much more 
important is that the synthisizer had some bad spurs.  Not usable for TX and 
annoying on RX.

73,
Ron WD8SBB

--- On Thu, 12/22/11, Ron wd8...@yahoo.com wrote:

From: Ron wd8...@yahoo.com
Subject: Re: [Drakelist] TX-4C  160 Mod ?
To: Robert Fish rwf...@comcast.net, Kihwal Lee kih...@yahoo.com
Cc: drakelist@zerobeat.net drakelist@zerobeat.net
Date: Thursday, December 22, 2011, 5:31 PM

anyone wanting a PDF of that page from HR with the image, let me know directly.

73,
Ron WD8SBB

--- On Thu, 12/22/11, Kihwal Lee kih...@yahoo.com wrote:

From: Kihwal Lee kih...@yahoo.com
Subject: Re: [Drakelist] TX-4C  160 Mod ?
To: Robert Fish rwf...@comcast.net
Cc: Ron wd8...@yahoo.com, drakelist@zerobeat.net drakelist@zerobeat.net
Date: Thursday, December 22, 2011, 11:46 AM

I captured, inverted and printed the image from HRM. It's not ideal but will do 
until someone produces and sells better one. Thanks for the info!
Here is a picture of my R-4A:http://tinyurl.com/79yhu62
Kihwal, K9SUL
On Dec 21, 2011, at 8:16 AM, Robert Fish rwf...@comcast.net wrote:

Hi Guys,

I am not sure how good the print quality is, but the entire collection of HR 
magazine (or most of) has recently been made available for download in PDF or 
just about any format you chose here:

http://www.archive.org/search.php?query=collection%3Aham-radio-magazinesort=-publicdate

By the way, 73 magazine archives are also available here:

http://www.archive.org/search.php?query=collection%3A73-magazinesort=-publicdate

I have already spent a bunch of time searching around through this stuff. Lotsa 
fun.

73,

Bob  K6GGO

I think the discussion is now about the expanded preselector dial that came 
with the FS4.  HR magazine had home brew FS4 in Aug 1972 issue.  That article
  had a copy of the dial in print.  That might be where you can pick off a high 
resolution image if you have an origial.

I sold my incomplete set of HR mags when I purchased the entire PDF collection. 
 The PDF of the page that the dial is on is not that great.  OTOH you might be 
able to use it for a starting point to do image restoration and enhancement.

Aug 1972 - Ham Radio (Pg. 6)
Frequency Synthesizer for the Drake R-4 Receiver
Author: Stein, Robert S., W6NBI

Sorry if I misunderstood the
 thread.

73,
Ron WD8SBB

--- On Tue, 12/20/11, Jim Shorneyjshor...@inebraska.com  wrote:




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-Inline Attachment Follows-

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[Drakelist] 2 Pin Plugs

[Patrick Jones]

Hi and happy holidays,
I need to find the 2 pin plugs that are used off the power supplies for keying 
an amp like a L-4B. Any ides??

Thanks,
Pat,W7EHM


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Re: [Drakelist] AC-4R Surprise

[Garey Barrell]

Curt -

The 0A2 is always difficult to test, as most inexpensive testers don't have enough high voltage DC 
to fire.  As I said earlier, I think you have a problem with your Pin 6 of V8 resistance 
measurement.  There is a 6.8k and 6k resistor in series between that pin and the +250 bus.  
Depending upon ohmmeter polarity, you have either an electrolytic cap or a diode to ground at that 
point.   I rarely use the resistance charts, as they are just too reliable on what meter was used to 
derive them.


When a resistance check is off, do a reality check by looking at the DC path..

--
73, Garey - K4OAH
St Charles, IL

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com


rhule...@comcast.net wrote:

I've checked all of the tubes with my old emission tester, all test good 
except for the OA2 which lights up but tests bad.  Not sure how valid that is.

And with V8 removed, the resistance at pin 6 is still 15k rather than 90k per 
the manual. I'm in process of resistance checking the rest of the tubes.

Sorry for the stream of consciousness dialog about this, I'll let all know if 
the cause of resistors opening in the power supply and shorting in the rig is ever found.

73, Curt KB5JO



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Re: [Drakelist] 2 Pin Plugs

[Jim Shorney]

On Thu, 22 Dec 2011 18:29:52 -0700, Patrick Jones wrote:

Hi and happy holidays,
I need to find the 2 pin plugs that are used off the power supplies for keying 
an amp like a L-4B. Any ides??


Discussed lots in the past:

http://www.mail-archive.com/search?q=vox+plugl=drakelist%40zerobeat.net

73

-Jim



--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, 
HyGain 3750, IBM PS/2 - all vintage, all the time!

Give a man a URL, and he will learn for an hour; teach him to Google, and he 
will learn for a lifetime.

HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://incolor.inetnebr.com/jshorney
http://www.nebraskaghosts.org



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Re: [Drakelist] Speaking of breaking Glass...

[Jim Shorney]

On Thu, 22 Dec 2011 12:54:59 -0500, Curt wrote:

 It 
got so hot, the glass melted and a hole was sucked thru the side without 
breaking the rest of the tube.

I saw something similar years ago in a sweep that was pulled from one of those
horribly designed 11-Meter amps. The glass  had been sucked inward and melted
to the outside of the plate structure in one spot. It's been over 35 years ago,
but I think I recall that the vacuum actually held.

73

-Jim


--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, 
HyGain 3750, IBM PS/2 - all vintage, all the time!

Give a man a URL, and he will learn for an hour; teach him to Google, and he 
will learn for a lifetime.

HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://incolor.inetnebr.com/jshorney
http://www.nebraskaghosts.org



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