Yes, there is a T-R switch in her setup.
The transmitter is a Globe Chief 90 with keying modifications, driving an 813
GG amp.
There are changes made by Drake in 2-B s/n's 2000 - 6290 that are referred to
in the ad.
Join us at DrakeRadio Group on Yahoo!
drakeradio-subscr...@yahoogroups.com
Apparently I've become 'persona non grata' over there.
At 12:00 PM 4/1/2012, you wrote:
DrakeRadio is looking more and more attractive.
Ignorance is bliss
Perhaps, but there I only have to send a message ONCE for it to post
Well, do us both a favor...stop polluting the list with your
I apologize for the confusion I have caused.
As a result of being 'uninvited' to post here on 'drakelist', I will be on
drakera...@yahoo.com
effective immediately.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
caps or a trimmer...
Steve Wedge, W1ES/4
Live free or die: Death is not the worst of evils.
John Stark.
All my computers have my signature with various pearls of wisdom appended
thereto.
--
From: Garey Barrell k4...@mindspring.com
Sent: Thursday
Why not just replace C1 and correct the offset??
C1 needs to move the CO up about 800 Hz to put it within the passband of the LSB, anywhere from
about 800 to 2000 will work.
The frequency of the SIDETONE has nothing to do with the offset. It should be about 800 Hz, to
approximate the
Peter -
No, this is not typical.
There are a couple of possibilities. There is some variation in controls when the are at either end
of their rotation. In some cases, when the control is fully CCW there is still some resistance
between the wiper and the lower end of the control. The
Bent -
Several possibilities.
One is an 'open' component in the Cathode circuits of the PA. IF there is +650V on the Plates, 270V
on the Screens and the Cathodes are grounded (via a relay contact), the PA tubes WILL draw current,
regardless of the rest of the radio. This current would peg
Is anyone else having problems with Drakelist? Or more accurately SPAMCANNIBAL.
The message I just posted had to be sent three times before it went through.
Perhaps this is why there is so little activity on Drakelist.
DrakeRadio is looking more and more attractive.
--
73, Garey - K4OAH
Glen
Thanks for the replies. This seems to be some sort of SPAM trap on one of the links between me and
the Drakelist server. I have NO spam controls via my provider, other than their standard stuff,
which seems to work quite well. Once every two-three weeks I'll get a message from them with a
Paul, Al and others -
The resistor is a 1.5k, (1W is better). I don't know when Drake specifically changed over, but if
your T-4XC doesn't already have the resistor between Pins 6 and 9 of V10, you need to add it. See
attached sheet from the CD.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B,
Gary -
The off-resonance current can exceed 400 mA, which makes it a little difficult to see the dip. Most
T-4Xs will load to better than 240W and higher on CW.
The meters are the same, only the scale was changed. The Cal resistor, R38,
was changed to compensate.
Since it's best to tune
Dave -
No, there is no jumper in the TR-4. The jumper in the TR-3 was to turn the internal PTO on,
removing it allowed the internal PTO to be controlled by the RV-3/4.
Check Pin 7 in the TR-3, one of the corner pins, for 12 VAC. It's not switched or anything, so if
it's not there you'll
Steve -
That may be because there hasn't been much coming from this list recently. The DrakeRadio@yahoo has
been pretty busy for the last week or so. Just about all the same people belong to that list as
this one, and activity seems to swing back and forth between them. It's best to
Paul -
Almost all the meters are the same. The very early T-4X meters were 400 mA full scale, but they
changed over to 500 mA pretty quickly. So any one will work. For that matter the S-Meters are all
the same as well, but the scales are not easy to swap.
73, Garey - K4OAH
Glen Allen, VA
John -
Hutson Ind. www.hutsonind.com
p/n SIP040(3) 40A, 50V _isolated_ SCR.
~$10
I don't know who's stocking them today. Allied, Newark??
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
John Rowland wrote:
anyone
John -
Another possibility is the NTE5562.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
John Rowland wrote:
anyone know the repl. for motorola scr no. C228F3 in PS-7 ? and what
distributor stocks it?
Thanks -
Robb -
I don't recognize the HEP6050, and can't find any data on it. It's a Motorola 'replacement' (like
NTE) and 'may' be an MC1496. If so, there may be a PD in Ham Radio. The original 'Sartori' PD, that
I think became the Sherwood used a TL-422 originally, and later subbed with a '1496.
Here is the information that Drake left out of their manuals!
Unique supplemental service information CDs available for the Drake TR-4, TR-4C/Cw/CwRIT, A, B and C
Lines, 2-C / 2-NT and the 2-B receiver.
High resolution color photos of the under chassis and individual PC boards of each unit,
, it came from Steve's Son of Laptop!
- Original Message - From: Garey Barrell k4...@mindspring.com
To: Mike Bryce proso...@sssnet.com
Cc: Randy WB4SPB wb4...@earthlink.net; drakelist@zerobeat.net
Sent: Friday, March 09, 2012 10:21 PM
Subject: Re: [Drakelist] R4B Audio Distortion
Mike -
I think
Larry -
Simplest is the AC-4R from www.heathkitshop.com which replaces all active components. If you want
to keep it 'original', new 'Twist-lok' style caps are available from www.hayseedhamfest.com.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service
Mike -
I think the problem is that 'new' tubes are 50 years old.. Even a few molecules of air a day adds
up after that long. When Drake assembled the radios, the tubes were _really_ new!! The 6EH5 gets
'really' hot in normal operation, and perhaps the heat/cool cycles are harder on the
Joe -
Hmmm. Have you checked your 'Junk' file or other virus software 'problem'
receptacle?
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Joe Pyles wrote:
I haven't received any messages since 2/22/12. I know there
Joe -
Your mail is getting out ok via the list. The other Joe was having a
problem and found
Last night I tried to have the drakelist send me my password again and it came
through in seconds.
The option for mail delivery was disabled, I enabled it and I have started
getting messages
The last message I just sent through the reflector was 'bounced' the first time by something called
'SPAMCANNIBAL', which I assume is one of the blacklisting 'services'. I turned around and sent it
again, and it went through, whether through the same path or not, I don't know.
We had this
Bounced the first time, went through the second...
--
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
___
Drakelist mailing list
Drakelist@zerobeat.net
Everybody is over on drakera...@yahoo.com the last few days.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Charles Ring wrote:
Is this list functional? Nothing in it for a week here.
73 de W3NU
Lee -
OK. You can make a filter to just dump any message with 'Sherwood' in the Subject, or even in the
text of the message, and you'll never see it!
Personally I'm not interested in them either, but I'm still interested in
discussion about them.
I think a 'Sherwood Free' Drake reflector
Mike -
These tubes should NOT have shields on them. The shield base is enough shielding and adding the
shield only increases the heat, decreases the tube life. Leave them OFF.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
An error in the C-Line and TR-4C CDs has been brought to my attention.
The error is in the T-4XC and TR-4C Relay Replacement Sheet. It SHOULD read as
follows.
.
Replacing the T-4XC Relay
The correct replacement relay is the PB (Tyco) R10-E1-Y4-V2.5k, same relay
used in the late T-4XC
You'd think I would know better by now. I should never attack these problems when it's past my
bedtime..
The original document for the T-4XC is correct, involving Pin 6 and Pin 9 of
the 6EV7 socket.
The TR-4C version is NOT correct, as Drake reversed the triodes in the TR-4C,
Paul -
Nope! Entirely different circuit. The S-Meter in the T-R4C is also the ALC (transmit AVC)
indicator. It will read 'upscale' in transmit showing the ALC is operating. Adjust GAIN control
while speaking until meter kicks up slightly for maximum output.
73, Garey - K4OAH
Glen
Peter -
The setting of the Passband tuner is not significant when doing the Preselector alignment. All
you're looking for is an amplitude peak. Sometimes the Calibrator signal is too strong, especially
on the low bands, driving the AVC too far and making it difficult to see the peak as you
Steve -
One exception. The R-4 had different slug heights, and a different alignment procedure. Other than
that, all slugs should be at the same height. There is no reason for the relationship to change
over time, so as long as the glyptol is unbroken, leave 'em alone.
The other situation
Lee -
I assume you mean 3/64. It's also possible that someone has been 'fixing' the pointer adjustment
too!! I would NOT change anything and just go with where they are.
I've seen them with 'red' on the top of the core and on the bottom of the core. I don't know what
criteria were involved
Carl -
Ron's method is very accurate, as long as you verify the resistance of the
cathode resistors.
Part of a restoration usually involves replacing the meter shunt resistor, (R36, with a 1W,) and
then selecting a calibration resistor, (R38,) to make the panel meter read 70 mA (little mark
Randy -
Sounds like a classic case of a 'gassy' (grid emission) tube. Replace it!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Randy WB4SPB wrote:
Hi folks,
I've owned my beloved R4B since the mid-70's. From about
several old Apple Computer power switching devices that used to sit under monitors. They're
great.
Larry, N8QNM
*From:* Garey Barrell k4...@mindspring.com
*To:* Larry Sack n8...@yahoo.com
*Cc:* Drakelist@zerobeat.net Drakelist@zerobeat.net
*Sent:* Thursday, February 9, 2012 10:31 PM
*Subject:* Re
. The original is a 6EH5, the spares were 6CA5. I believe (hope) there is no material
difference. All behave the same way.
The one I ordered turned out not to be a new tube by any stretch of the imagination. Where do you
like to buy tubes?
73,
Randy WB4SPB
- Original Message - From: Garey
Curt -
I guess I'm missing the objective here. I have several SoftRocks, Ensemble, etc., and the biggest
'feature' they offer is the ability to see large chunks ( 48, 96 or 192 kHz ) at a time. If you tap
off in front of the roofing filter, 5.645 MHz 1st IF, all you are gaining is an RF
Panadapter
concept.
Mine was in an external, diecast shield box, so I did not have any issues with
radiation from the
SDR.
All over again, would just build the Ensemble like you suggest.
Fun tho.
Curt
KU8L
On 2/9/2012 9:44 AM, Garey Barrell wrote:
Curt -
I guess I'm missing the objective
want to use the excellant RX on the R-4C, HW or SW solution would be OK...but I prefer a HW
solution.
Thanks,
73,
Lee, KC9CDT
-Original Message-
From: Garey Barrell k4...@mindspring.com
To: Curt cptc...@flash.net
Cc: drakelist drakelist@zerobeat.net
Sent: Thu, Feb 9, 2012 9:45 am
Paul -
The 7 is a lot more amenable than the 4. It has wideband filters in front, so the first real
selectivity is the 45 MHz roofing filter. Each BAND is much wider than usable by the SDR.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement
Steve -
I found the 'C100 mod' to be more effective than the Schottky diode mod in
reducing 'hiss'.
73, Garey - K4OAH
Glen Allen, VA
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'm considering it, Lee. This receiver is nowhere
Lee -
Everything you need to know is here...
http://www.wb5rvz.com/
The SR-40_R is the current single band version that is used for panadapter
service.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
kc9...@aol.com
Larry -
Perhaps I misunderstood your statement, but the AC-3 bolts right in to the MS-4 speaker, just like
the AC-4.
That said, it IS a much better idea to put some sort of protective cover over it, since fingers have
a way of finding themselves in contact with HV.
The stuff known as 'cane
Rick -
What you describe is NORMAL operation..
When the receiver switch is set to ON, surprise! the receiver is ON!
Regardless of any other setting.
Likewise, when the receiver is set to EXT MUTE, it is capable of being muted externally! Obviously
if you want to use the Noise Blanker
Thanks Gary!!
Rick -
What you describe is NORMAL operation..
When the receiver switch is set to ON, the receiver is ON! Regardless of any
other setting.
Likewise, when the receiver is set to EXT MUTE, it is capable of being muted
externally! Obviously
if you want to use the Noise
right.
Gary
WB6OGD
- Original Message -
From: Garey Barrell k4...@mindspring.com
To: Rick Wallace rikw...@attglobal.net
Cc: 'Drake List' drakelist@zerobeat.net
Sent: Wed, 08 Feb 2012 15:31:10 - (UTC)
Subject: Re: [Drakelist] Receive/Transmit Relay? Mute Problem?
Rick -
What you describe
-
From: Garey Barrell [mailto:k4...@mindspring.com]
Sent: Wednesday, February 08, 2012 7:31 AM
To: Rick Wallace
Cc: 'Drake List'
Subject: Re: [Drakelist] Receive/Transmit Relay? Mute Problem?
Rick -
What you describe is NORMAL operation..
When the receiver switch is set to ON,surprise
No, you don't NEED to run the fan for SSB.
However, unless it bothers you, (perhaps not the 'silent' Drake fan?,) it will improve the stability
of the transceiver 'short term', and extend the life of the transceiver 'long term'.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B,
Lee -
That sounds about right for the T-4XC Remember, this IS AM! About 20W output is typical, you
only want about 150 mA on voice _peaks_, or about 50W out.
You can swap out V7, and check the value of R63, but it doesn't sound out of line. Of course it HAS
been about 35 years since
Lee -
Last resort, I READ THE MANUAL!! :-)
The L-4B manual says that the drive should be adjusted for approximately 500W INPUT to the L-4B with
no modulation.
Now That was written when transmitter power was regulated by INPUT power, and would
theoretically result in 2000W INPUT of AM
Lee -
I'll never learn... The '500W input carrier' level for the L-4B is for an AM input, i.e. full
carrier.
I still think that 15-20W input to the amp for about 150 to 200W output carrier
is about right.
I'll be quiet now and wait for someone who knows what they are talking
Peter -
I also forget to state what 'everyone knows', which is that the first thing is to go through with a
screwdriver and tighten all grounding hardware. The mounting FEET of the small boards are almost
all ground connections.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A,
Steve -
Ooops, you may be right. 40 years is even longer! :-) I may be confusing it with the 7 Line
filters, but I 'think' there is a clearance hole for the stud.
The only reason I can think of for putting a 150 ohm resistor on the rear panel would be if you
wanted an 8 kHz wide passband
Bob -
As I said, 40 years is a Lng time. Stupid synapses... :-)
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Bob Loving wrote:
Steve, I think Garey meant that the 2nd IF filters in the R-4C, like the
Rick -
Sounds like the BIAS supply filter cap. Dunno why it would 'fix itself', so might be a bad ground
connection on the supply. Check the screws in the ground terminals on the Power supply board. It's
good practice to go all over the radio and tighten ALL ground screws. Most of the card
.
Steve Wedge, W1ES/4
Live free or die: Death is not the worst of evils.
John Stark.
All my computers have my signature with various pearls of wisdom appended
thereto.
--
From: Garey Barrell k4...@mindspring.com
Sent: Tuesday, January 31, 2012 11
Larry -
Transformer leads are not polarized. They are AC, Alternating Current!. In the US, the 'polarity'
flips back and forth (one lead + or -, and the other lead - or +) 60 times/second.
The rectifiers form a Full Wave Voltage Doubler, providing 650 VDC full load from a transformer AC
Lee -
No, the 2.4 kHz filter is under the chassis, along the back wall.
I know all about that 'memory' stuff! :-)
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
kc9...@aol.com wrote:
Steve,
The 2.4 filter plugs into
Bill -
Sounds almost like it's in SPOT. Possibly a switch anomaly. There can't be PLATE (Cathode) current
on the meter ''normally unless the relay is pulled in. Check carefully around the meter terminals,
if one of the terminals is shorting to the chassis?
So. Just a guess, but
Ron -
Pin 9 of the PS-7 Control connector. The 10 Pin Jones connector. Pin 10 is
ground.
Some day when you're bored, you could go in and link Pin 9 over to that SPARE
phono jack just above it.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service
Ron -
Oh, and the VOX relay contact is right next to it on Pin 8. A REAL relay contact too, none of this
wimpy reed relay stuff. :-)
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Ron wrote:
I am sure that are
Ron -
I'd be inclined to use the fixed 'line' AUDIO jack. The counter input can be handy, obviously as a
counter, but also as a good quick troubleshooting tool for the radio.
The other alternative of course is to get the proper connector, they are available, or use the
'spade' type power
Ron -
Yes, that is a good way to speed up the amp keying. A half mA shouldn't be a problem, those lines
are 'fused' very closely, but they should survive that! :-) Saves a whole ~25 mSec!!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service
Jim Shorney wrote:
On Sat, 28 Jan 2012 13:08:15 -0500, Garey Barrell wrote:
A half mA shouldn't be a problem, those lines
are 'fused' very closely, but they should survive that! :-)
That's actually funny, because years ago I first heard tech calling transistors
three-legged fuses
Michael -
The open circuit voltage is about -65, and the current is less than a mA. No
need for any protection.
If you're feeling adventurous, you can lick your finger and key the transceiver by putting it across
the key.
The TO was around when many (most?) transmitters were cathode keyed,
Dennis -
You said it better than I did..
1. Arbitrarily changing an AB1 linear amplifier to Class C merely by adjusting the bias, is NOT a
good idea.
2. 'Considerably' more drive 'power' is required for Class C, vs NO 'power'
for Class AB1.
3. Grid dissipation is higher in Class C,
Gary -
In a word NO.
The PA stage is operated as a LINEAR amplifier, Class AB1, meaning the output signal is a reasonable
facsimile of the input signal. The BIAS voltage is carefully chosen to 'center' the operation of
the amplifier in the linear portion of the tube's operating region.
don't
really need full power...
Don't ya think? Changing bias for CW wasn't my idea, but it did sound good to
me.
TIA, I am trying to learn here... There probably IS some reason nobody did this
originally!
73,
Gary
WB6OGD
- Original Message -
From: Garey Barrell k4...@mindspring.com
Pete -
No, Bob is the source. I just saw a message from him the other day, so he is
about.
His e-mail and phone are at
http://www.wb4hfn.com/Services/W7AVK/tr7ext2.htm
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Pete -
Why are you replacing the Varley?
I would suggest verifying that the terminal layout is identical, it 'almost'
certainly is.
Rather than the 'W' contact material, I would suggest the 'Y' used by Drake. The 'W' material
(Silver Cadmium Oxide) is rated at 500 mA _minimum_, 7.5A
Pete -
Couple of factors make this relay suitable...
1. 150W into 50 ohms is only about 1.7A, so no problem there.
2. The Drake 'yank-in' VOX system 'probably' closes the contacts before any RF gets to them,
limiting the 'make'.
3. The more damaging 'break' comes after the RF is long
contact Garey Barrell K4OAH and see if he is getting e-mails
from me through the list AND direct...
Seems like I have sent him several e-mails in the last few days with no
response...
Thanks,
Lee, KC9CDT
___
Drakelist mailing list
Drakelist@zerobeat.net
http
Lee -
I am receiving your posts to the Drakelist just fine, just nothing direct.
Evan -
Spoke too soon. This message was bounced from Drakelist by something called SPAMCANNIBAL... Good
grief
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service
Lee -
It looks like the internet robots aren't going to allow us to converse directly. Hopefully you are
getting list mail ok..
You made a statement some time back that you had the same problem with BOTH an R-4A AND an R-4B.
The point I have been trying to get across for the last week or
Rick -
Pretty close for your line voltage. A little high, but not critical. I assume you are measuring
just the supply, no load.
750 VDC
300 VDC
-70 to -100 VDC
14.5 VAC
The filament voltage is high because of the cable and the heavy load (lotsa
filaments) 5.5 Amps.
73, Garey - K4OAH
Curt -
Not at all! The first step with a 'new' piece of gear, (right after verifying that the CORRECT fuse
is in the fuseholder,) is to go through and tighten all hardware, especially that which holds ground
lugs or shields to the chassis.
You don't see that many bad solder joints on Drake
Mark -
Interesting. A primary voltage of 121.5 VAC resulted in measured AC voltages out of the transformer
at 266 VAC, 108 and 98. The filament measured 14 VAC, all no load.
266 x 2.828 = 752 V peak
108 x 2.828 = 305 V peak
Both have very high bleeders, a mA or two so will reach near
Lee -
IS THE SERIAL NUMBER A SECRET??
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
kc9...@aol.com wrote:
Gary,
Here is my original post:
___
Drakelist mailing list
, there are two rx doing the same (two serials)..
- Original Message -
From: Garey Barrell k4...@mindspring.com
To: kc9...@aol.com
Cc: drakelist@zerobeat.net
Sent: Sat, 14 Jan 2012 19:29:13 - (UTC)
Subject: Re: [Drakelist] Interesting discovery/problem about R-4A R-4B
Lee -
IS THE SERIAL
Gary / Lee -
No problem, got you both through the list.
Lee - you have the k4...@mindspring.com..
Thanks Gary
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Gary Winblad wrote:
Garey,
Do you copy Lee??
Gary
-
Greg -
Sounds like you might have a bad tube. Possibly an open (or greatly increased value) Cathode
resistor (15 ohm, 1W) on one tube.
Measure DC voltage across each one in PTT (idle current), each should have about one half volt (0.5)
across it for 15 ohms.
Possible weak Driver tube,
.
--
From: Garey Barrell k4...@mindspring.com
Sent: Thursday, January 12, 2012 9:55 PM
To: Drake List drakelist@zerobeat.net
Subject: Re: [Drakelist] S-meter balance: ain't the tubes.
Couple more possibilities
Since 'someone' has been 'fixing' the meter, is it still ~ 3mA full scale ~
700 ohms
Lee -
What is the serial number of your R-4B???
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
kc9...@aol.com wrote:
Gary,
Thanks for the information...yes,,,I get the clicking/static like sound as
described.
Not
Mike -
Couple of things.
1. The L-4 never was sold with 4-400s. I assume you mean 3-400Zs.
2. Electrically, yes, you can replace the 3-400s with 3-500Zs. The problem is that the '500s are a
little taller and won't fit in some of the chimneys Drake supplied. There really isn't any reason
can train dogs to do tricksbut I think I'm just too thick to learn this
one!
Thanks for the insight Garey.
73,
Greg Roecker/n4osj
Roswell, GA.
-Original Message- From: Garey Barrell
Sent: Friday, January 13, 2012 10:01 AM
To: m coffey
Cc: drakelist@zerobeat.net
Subject: Re
Lee -
Interesting. What is the serial number of your R-4B??
I haven't thought this all the way through, although I'm suspicious! :-)
R-4 receivers up through the R-4B, s/n 10501, had AVC applied to the grid of the Noise Amp tube.
Effective with this version, the AVC was removed, and
Steve -
Well, a couple of choices.
1. The bridge is not balanced. One or more of the 'legs' is not what it has
to be.
2. The current being drawn by the Plates of V4 and V5 is NOT equal to the Plate and Screen current
drawn by V2 and V3.
Have you measured element voltages on the four
Couple more possibilities
Since 'someone' has been 'fixing' the meter, is it still ~ 3mA full scale ~
700 ohms resistance?
Also, try a new 6BZ6. I have seen cases where a gassy 6BZ6 will drag down the AGC2 buss, screwing
up the RCVR SENS (R87), which screws up the AGC buss, which ...
Fred -
Please forward the entire message to keep the thread intact. It helps to be able to go back to see
what has been done.
If you have a scope, close the PTT and check the 5.645 MHz CO signal at the wiper of the BALANCE
pot. -OR-
If you have a general coverage receiver, see if you can
Adrian -
You don't need a lot of air. Just a 'gentle breeze' that can be totally silent. Computer fans are
cheap and quiet. Run a noisy one at a lower voltage/
Easiest to sit on top of the cabinet over the PA, _BLOWING UP_. Rubber or foam 'feet' just to
keep it in place and prevent
Lee -
Check D3 for leakage.
Clean switch contact on S3(f)
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
kc9...@aol.com wrote:
Hi gang,
DX sure has been fun lately!
Been working on a R-4A, 11 tube versionit's
Mark -
Here's a suitable one. Rated at 15A, so should handle a couple of T-4X and a receiver or two
without problems.
Lots more out there, 'computer power center'.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Mark
Mark -
Here's a suitable one. Rated at 15A, so should handle a couple of T-4X and a receiver or two
without problems.
http://www.amazon.com/Eliminator-E107/dp/B000OMXZ3I/ref=pd_cp_e_2
Lots more out there, 'computer power center'.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A,
Bob -
Yeah, but I spend a LOT more time listening than I do transmitting. The receiver(s) are on just
about all day, the transmitter only for an hour or so. So individual control is still useful. It's
not 'carrying the current' that kills the contacts, as long as they are properly rated.
Curt -
The 4 Line receivers have Ground - 6V - 12V. So one 12V line is grounded. The R-4C has only 6 VAC
filaments.
The transmitters and TR-(any) have only a single 12 VAC filament supply. Be careful where you get
the voltage here, as there are several series string arrangements to power 6
Mark -
Absolutely NO denigration of your modification. Well thought and and perfectly
executed.
Re #1 below, I'm not sure what 'script' is supposed to be??
The multi-switch computer 'Power Center' helps with the multi-station setup. A single strip is a
little cumbersome for more than one
Greg -
When the TR-4 was first sold, transmitters were specified as _INPUT_ power to the PA stage,
because that was the way the FCC regulations defined transmitter power in the Ham Radio
regulations. This is the 300W specified in the manual.
With NEW PA tubes and perfect alignment, you
Excellent job. The relay is certainly an effective way to protect that switch.
However ...
A simple power strip with enough outlets for a single station solves the AC switch problem. The key
is to switch the equipment on -OR- off _only_ when the power strip switch is OFF.
None of our
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