RE: [drakelist] Broken Vox/antiVox Pot.

[Rich Carter]

Carl
I'm glad I double-checked.  It is a 100K pot.
 
It does indeed have a slot on the back of the pot for a screwdriver.  I can
turn the pot if I pull the chassis open, but this isn't a permanent fix.
I'd like to replace the darn thing.
 
Regards
Rich
 
 


  _  

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of [EMAIL PROTECTED]
Sent: Tuesday, January 22, 2008 6:13 PM
To: [EMAIL PROTECTED]
Subject: Re: [drakelist] Broken Vox/antiVox Pot.



 [EMAIL PROTECTED] writes:

I broke the anti-vox adjustment pot.  This is a 500K pot.   It has a black
plastic shaft. 

Rich on a TR4 the VOX pot is 500 K  the Anti VOX is 100k.  Yes you could
swap the plastic shaft but to do so you have to remove anyway.  Please
verify which one and advise. 
In the interum..   I do not know if you noticed but there is a
screwdriver adjust slot on the inside of the pot, and I am assuming you have
the lower cover off. 
Carl 




  _  

Start the year off right. Easy ways to stay in shape
  in
the new year. 

Re: [drakelist] premizer alignment puzzler

[Byron Tatum]

"Byron Tatum" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Hello Rich-
   One thought comes to mind -- Are you sure the crystal itself is 
oscillating and not the L/C circuit of adjusting coil? I believe in a 
previous message I saw frequencies listed, which were measured ,and they 
reasonably agreed with the crystal frequencies. But thought I would ask this 
first before ruling it out.

   Thanks, Byron WA5THJ.
- Original Message - 
From: <[EMAIL PROTECTED]>

To: <[EMAIL PROTECTED]>
Sent: Tuesday, January 22, 2008 2:03 PM
Subject: [drakelist] premizer alignment puzzler




[EMAIL PROTECTED] made an utterance to the drakelist gang
--
I am in the process of restoring a TR-3.  I've spent a great deal of time 
trouble-shooting the premixer, but I'm stumped.  I'm about ready to throw 
my hands up and send it out for repair.  I'm not too cheap to pay someone 
to help out with this, but I started restoring this rig to help become 
more familiar with tube transceivers and analog circuits.  I hate to give 
up.


The radio works well on 20 and 80 meters.  On 40 meters, the premixer 
oscillator runs at 16.3 mhz instead of 20.5mhz.  I get no power out.  On 
the 15 and 10 meter bands, the crystals read low by about 100khz.  Last 
night, I poked around with a scope a little more and tweeked the 20m 
crystal alignment inductor and suddenly the premixer was working.  I had 
precisely 20.5mhz on 40m and the other bands measured correctly too.  I 
found two leads under V3 that looked like they may have been shorted, so I 
blamed my problems on that.


Emboldened with success, I proceeded to run through the alignment 
procedure.  I went through the injection coupler alignment and on to the 
receiving IF alignment.  Then everything went south again.  Figuring that 
maybe I had a thermal issue, I turned the rig off and let is sit 
overnight.  My hope was that this morning I would find the premixer 
working again.  No such luck.  I suspect that there may be something wrong 
with the alignment I did.  I've double-and triple checked the steps in the 
procedure.  I've poked around with an insulated tool to see if I could 
find a bad solder joint or cracked component.  I've cleaned the band 
switch several times.


The alignment instructions were written for folks who lacked modern test 
equipment.  Maybe there's an easier and more precise way to align the 
premixer.  If it isn't something I did, then there is something marginal 
or intermittent in the circuitry.


I'll have to admit that my analog background is limited.  I can use a 
scope and I'm comfortable with digital circuits.  I have a good scope and 
know how to use it.  I'd appreciate any pointers from the group.  I know 
that Mark (N1VQW) is wrestling with his premixer too, so any tips would 
probably get double-duty.


Thanks in advance
Rich KE1EV



--
Rich Carter

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Re: [drakelist] Broken Vox/antiVox Pot.

[Gypsymt34]

 
[EMAIL PROTECTED] writes:

I broke  the anti-vox adjustment pot.  This is a 500K pot.   It has a  black 
plastic shaft. 


Rich on a TR4 the VOX pot is 500 K  the Anti VOX is 100k.  Yes  you could 
swap the plastic shaft but to do so you have to remove  anyway.  Please verify 
which one and advise. 
In the interum..   I do not know if you noticed but  there is a 
screwdriver adjust slot on the inside of the pot, and I am assuming  you have 
the lower 
cover off. 
Carl 



**Start the year off right.  Easy ways to stay in shape. 
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp0030002489

Re: [drakelist] premixer alignment puzzler

[re . carter]

[EMAIL PROTECTED] made an utterance to the drakelist gang
--

Fumble-fingers made an important type in the message below.  The message should 
read
"I had precisely 21.5mhz on 40m", which is the correct frequency. 

--
Rich Carter

 -- Original message --
From: [EMAIL PROTECTED]
> 
> [EMAIL PROTECTED] made an utterance to the drakelist gang
> --
> I am in the process of restoring a TR-3.  I've spent a great deal of time 
> trouble-shooting the premixer, but I'm stumped.  I'm about ready to throw my 
> hands up and send it out for repair.  I'm not too cheap to pay someone to 
> help 
> out with this, but I started restoring this rig to help become more familiar 
> with tube transceivers and analog circuits.  I hate to give up.
> 
> The radio works well on 20 and 80 meters.  On 40 meters, the premixer 
> oscillator 
> runs at 16.3 mhz instead of 20.5mhz.  I get no power out.  On the 15 and 10 
> meter bands, the crystals read low by about 100khz.  Last night, I poked 
> around 
> with a scope a little more and tweeked the 20m crystal alignment inductor and 
> suddenly the premixer was working.  I had precisely 20.5mhz on 40m and the 
> other 
> bands measured correctly too.  I found two leads under V3 that looked like 
> they 
> may have been shorted, so I blamed my problems on that.
> 
> Emboldened with success, I proceeded to run through the alignment procedure.  
> I 
> went through the injection coupler alignment and on to the receiving IF 
> alignment.  Then everything went south again.  Figuring that maybe I had a 
> thermal issue, I turned the rig off and let is sit overnight.  My hope was 
> that 
> this morning I would find the premixer working again.  No such luck.  I 
> suspect 
> that there may be something wrong with the alignment I did.  I've double-and 
> triple checked the steps in the procedure.  I've poked around with an 
> insulated 
> tool to see if I could find a bad solder joint or cracked component.  I've 
> cleaned the band switch several times.  
> 
> The alignment instructions were written for folks who lacked modern test 
> equipment.  Maybe there's an easier and more precise way to align the 
> premixer.  
> If it isn't something I did, then there is something marginal or intermittent 
> in 
> the circuitry.
> 
> I'll have to admit that my analog background is limited.  I can use a scope 
> and 
> I'm comfortable with digital circuits.  I have a good scope and know how to 
> use 
> it.  I'd appreciate any pointers from the group.  I know that Mark (N1VQW) is 
> wrestling with his premixer too, so any tips would probably get double-duty.
> 
> Thanks in advance
> Rich KE1EV
> 
> 
> 
> --
> Rich Carter
> 
> --
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[drakelist] premizer alignment puzzler

[re . carter]

[EMAIL PROTECTED] made an utterance to the drakelist gang
--
I am in the process of restoring a TR-3.  I've spent a great deal of time 
trouble-shooting the premixer, but I'm stumped.  I'm about ready to throw my 
hands up and send it out for repair.  I'm not too cheap to pay someone to help 
out with this, but I started restoring this rig to help become more familiar 
with tube transceivers and analog circuits.  I hate to give up.

The radio works well on 20 and 80 meters.  On 40 meters, the premixer 
oscillator runs at 16.3 mhz instead of 20.5mhz.  I get no power out.  On the 15 
and 10 meter bands, the crystals read low by about 100khz.  Last night, I poked 
around with a scope a little more and tweeked the 20m crystal alignment 
inductor and suddenly the premixer was working.  I had precisely 20.5mhz on 40m 
and the other bands measured correctly too.  I found two leads under V3 that 
looked like they may have been shorted, so I blamed my problems on that.

Emboldened with success, I proceeded to run through the alignment procedure.  I 
went through the injection coupler alignment and on to the receiving IF 
alignment.  Then everything went south again.  Figuring that maybe I had a 
thermal issue, I turned the rig off and let is sit overnight.  My hope was that 
this morning I would find the premixer working again.  No such luck.  I suspect 
that there may be something wrong with the alignment I did.  I've double-and 
triple checked the steps in the procedure.  I've poked around with an insulated 
tool to see if I could find a bad solder joint or cracked component.  I've 
cleaned the band switch several times.  

The alignment instructions were written for folks who lacked modern test 
equipment.  Maybe there's an easier and more precise way to align the premixer. 
 If it isn't something I did, then there is something marginal or intermittent 
in the circuitry.

I'll have to admit that my analog background is limited.  I can use a scope and 
I'm comfortable with digital circuits.  I have a good scope and know how to use 
it.  I'd appreciate any pointers from the group.  I know that Mark (N1VQW) is 
wrestling with his premixer too, so any tips would probably get double-duty.

Thanks in advance
Rich KE1EV



--
Rich Carter

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Re: [drakelist] FS: AC-3

[Jim Pruitt]

Hello Steve.

Did you sell the AC3?  If not,  how much do you want for it?

Thank you.

Jim Pruitt

  - Original Message - 
  From: Steve Aronson 
  To: [EMAIL PROTECTED] 
  Sent: Monday, January 21, 2008 7:34 PM
  Subject: [drakelist] FS: AC-3


  I have an AC-3 power supply for sale that was used on a TR4 I recently sold.  
The buyer didn't need the power supply.  It is untested and hasn't been powered 
up in a number of years so I can't vouch for it's working condition as I don't 
have a variac yet.   FWIW, it was working before it went into storage, it 
belonged to my late father.   Feel free to email with questions, requests for 
pics, or offers.  Cosmetically, I would rate it's condition as average.

   

  73  Steve

Re: [drakelist] Broken Vox/antiVox Pot.

[re . carter]

Carl
This would be fantastic.  I don't care if the pot is exactly the same.  For 
that matter, it doesn't even have to be the correct value.  I could disassemble 
the broken pot and swap shafts if the replacement were close enough.  I broke 
the anti-vox adjustment pot.  This is a 500K pot.   It has a black plastic 
shaft.  I don't have the rig with me, but I know it doesn't have any 
manufacturer name on it, at least none that I could read without removing the 
pot.  I suspect Drake used the same source for all their pots.

I would only accept the replacement if I could either pay for it or return 
something of similar value.  You must at least need a spare tube or something.

Regards
Rich Carter - KE1EV
74 Talent Rd
Litchfield NH 03052

 -- Original message --
From: [EMAIL PROTECTED]
>  
> [EMAIL PROTECTED] writes:
> 
> Yes  indeed!  It is I.  I broke the shaft off mine.  Do you have a  
> replacement?  I'd be happy to pay a fair price for it or trade for a tube  or 
> other 
> item.  Rich Carter
> 
> 
> 
> Rich, It would be out of a TR4 chassis but I suspect still the same  per the 
> schematics, I have not measured.. Which specific one got broken?   Send a 
> full 
> mailing address.
> Carl WD8NHK
> 
> 
> 
> **Start the year off right.  Easy ways to stay in shape. 
> http://body.aol.com/fitness/winter-exercise?NCID=aolcmp0030002489


--- Begin Message ---




 [EMAIL PROTECTED] writes:
Yes 
  indeed!  It is I.  I broke the shaft off mine.  Do you have a 
  replacement?  I'd be happy to pay a fair price for it or trade for a tube 
  or other item.  Rich Carter

Rich, It would be out of a TR4 chassis but I suspect still the same 
per the schematics, I have not measured.. Which specific one got broken?  
Send a full mailing address.
Carl WD8NHKStart the year off right.  Easy ways to stay in shape in the new year. 
--- End Message ---

Re: [drakelist] Broken Vox/antiVox Pot.

[Gypsymt34]

 
[EMAIL PROTECTED] writes:

Yes  indeed!  It is I.  I broke the shaft off mine.  Do you have a  
replacement?  I'd be happy to pay a fair price for it or trade for a tube  or 
other 
item.  Rich Carter



Rich, It would be out of a TR4 chassis but I suspect still the same  per the 
schematics, I have not measured.. Which specific one got broken?   Send a full 
mailing address.
Carl WD8NHK



**Start the year off right.  Easy ways to stay in shape. 
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp0030002489

Re: [drakelist] Broken Vox/antiVox Pot.

[re . carter]

Yes indeed!  It is I.  I broke the shaft off mine.  Do you have a replacement?  
I'd be happy to pay a fair price for it or trade for a tube or other item.

--
Rich Carter

 -- Original message --
From: [EMAIL PROTECTED]
> Hello to the group,
> I really don't feel like going through the archives for this one.
>  
> Earlier this month (Jan '08) someone was working on a TR3, as I  recall, and 
> broke the plastic adjust screw off of a pot on the side of the unit,  can't 
> really remember which one.
> Is that party still looking for one?
> Carl WD8NHK
> 
> 
> 
> **Start the year off right.  Easy ways to stay in shape. 
> http://body.aol.com/fitness/winter-exercise?NCID=aolcmp0030002489


--- Begin Message ---



Hello to the group,
I really don't feel like going through the archives for this one.
 
Earlier this month (Jan '08) someone was working on a TR3, as I 
recall, and broke the plastic adjust screw off of a pot on the side of the unit, 
can't really remember which one.
Is that party still looking for one?
Carl WD8NHKStart the year off right.  Easy ways to stay in shape in the new year. 
--- End Message ---

RE: [drakelist] TR-3 crystals needed (was:TR-3 9 MHz osc & alignment questions)

[Bob Donnell]

"Bob Donnell" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
An "off the top of my head" thought would be to looking at coupling or
capacitors, since things work better at higher frequencies.  Mind you this
is without taking time to download a schematic and research it.  On the
other hand, I work with broad bandwidth RF PA's in my day job, though we
don't make any tube amps anymore.

73, Bob, KD7NM

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Mark Pilant
Sent: Monday, January 21, 2008 1:27 PM
To: [EMAIL PROTECTED]
Subject: Re: [drakelist] TR-3 crystals needed (was:TR-3 9 MHz osc &
alignment questions)


Mark Pilant <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
--
Well, I think it may have been a bad user on device :-) :-)

At Rich's (KE1EV) suggestion I measured the oscillator voltage and frequency
at V1a.  In particular, on the common crystal connection with only R3 and C2
between where I measured and the plate (pin 1) where Rich measured.  Here is
what I got:

   80m 0.0v
   40m 5.2v  21.496 MHz
   20m 0.0v
   15m 4.1v  35.496 MHz
   10(1)m  4.1v  42.495 MHz
   10(2)m  4.0v  42.994 MHz
   10(3)m  3.6v  43.592 MHz

Since there are no crystals for 80m and 20m, the 0V reading is
understandable.  These reading were taken after adjusting L1, L2 and L5 for
the maximum negative voltage at the test point.  I could get the frequencies
closer to the specs but the T.P.
voltage was not at the max.

So it would seem the band crystals are, in fact, OK.  I'm still puzzled why
the readings are so strange looking at V1b pin 3.
I'm going to have to think about this one for a while.

I'm getting there, and learning/remembering a bunch along the way :-)

73

- Mark  N1VQW

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[drakelist] Broken Vox/antiVox Pot.

[Gypsymt34]

Hello to the group,
I really don't feel like going through the archives for this one.
 
Earlier this month (Jan '08) someone was working on a TR3, as I  recall, and 
broke the plastic adjust screw off of a pot on the side of the unit,  can't 
really remember which one.
Is that party still looking for one?
Carl WD8NHK



**Start the year off right.  Easy ways to stay in shape. 
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp0030002489