I've been suspecting my filters are drifting too! A friend of mine had his
lower SSB filter go intermittent this weekend. I have a few Drake rigs and the
audio is not right coming out of a couple of them. I think the crystals in the
filters are drifting and producing weird shaped output
It’s a common problem with all of the TR-4 models, usually the LSB filter ( LSB
on 80 meters ).
73, Gary
http://home.roadrunner.com/~w8pu
R-4A T4-X R-4B T4-XB R-4C T4-XC MS-4 L-4B RCS-4
2A 2B 2C 2NT 2CQ 2AS 4-LF
TR-4 TR-4C TR-4CW/RIT RV-4C MC-4
TR-7 RV-7 CW-75 MS-7
WH-7 W-4 WV-4 MN-2700
Try Relay Specialists I think you can still order a new one.
Tim
WB8UHZ
On Tuesday, November 26, 2013 10:09 AM, k7...@comcast.net k7...@comcast.net
wrote:
Looks like my relay has an open coil. Does anyone have a part unit or a source
where I might purchase a new relay.
Thank you,
Thanksgiving to all,Ron / WB4HFN
From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net]
On Behalf Of amfone
Sent: Wednesday, November 27, 2013 8:13 AM
To: k7...@comcast.net; drakelist
Subject: Re: [Drakelist] TR-4C Relay
Try Relay Specialists I think you can
_eugeneb@nni.com_ (mailto:euge...@nni.com) writes:
Need a top for the PA finals cage and a new Plate
control shaft for a TR-4C.Gene K1NR
Gene,
Some of the TR4/4c's didn't have a top for the finals. In addition some
of the final tube heights won't allow the cover which I think is why
Cal,
Appreciate the info. It appears that the components in
my TR-4C will fit with a top. I will look again.
Thanks for checking on the shaft.
73
Gene K1NR
On Sat, 3 Nov 2012 14:46:20 -0400 (EDT)
gypsym...@aol.com wrote:
_eugeneb@nni.com_ (mailto:euge...@nni.com) writes:
Need
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
Bob,
If you feel that the voltage are too low for you, find an old cheap 3 to 4 amp
car battery charger (typically 24 volt center tapped for 12 volt battery).
Then wire the transformer with the primary on the 230 volts, and the secondary
boosting that voltage. Assume 230, plus a 12 volt
Bob,
Use a filament transformer with a secondary current rating equal to the full
load current of the TR-4C as an autotransformer to raise the voltage. If you
can find a single transformer with two five volt windings, you can use them
in series to get 10 volts, or you could use two five volt
: Garey Barrell k4...@mindspring.com
Cc: drakelist Drakelist@zerobeat.net
Sent: Saturday, July 16, 2011 10:23 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I just another couple of thoughts.
Looking back through the million or so messages regarding this problem, I
asked
Drakelist@zerobeat.net
Sent: Monday, July 18, 2011 11:28 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
OK. Good idea. Sometimes it helps to just step back and look at the
simple things again! :-)
For 'normal' operation of the PA, with the LOAD control at minimum, adjust
the PLATE
Message - From: Garey Barrell k4...@mindspring.com
Cc: drakelist Drakelist@zerobeat.net
Sent: Saturday, July 16, 2011 10:23 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I just another couple of thoughts.
Looking back through the million or so messages regarding
: drakelist Drakelist@zerobeat.net
Sent: Monday, July 18, 2011 2:23 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Garey et al,
I made resistance measurements on the RF Output switch on the LOAD shaft
with the switch in place and wires and resistor attached. I got steady
readings but wasn't
- Original Message -
From: Donley donley...@comcast.net
To: k4...@mindspring.com
Cc: drakelist Drakelist@zerobeat.net
Sent: Monday, July 18, 2011 12:23 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Garey et al,
I made resistance measurements on the RF Output switch on
the LOAD
Richard -
I just noticed your description of the slide switch. The original is NOT spring loaded, just a
standard two position slide switch. The spring steel 'hairpin' on the LOAD shaft is all that is
necessary to switch it back and forth.
73, Garey - K4OAH
Glen Allen, VA
- Original
donley...@comcast.net
Cc: drakelist Drakelist@zerobeat.net
Sent: Monday, July 18, 2011 11:28 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
OK. Good idea. Sometimes it helps to just step back and look at
the simple things again! :-)
For 'normal' operation of the PA
Thanks to all involved for posting all the to and fro in this thread. It's
what makes reflectors so interesting and useful!
73
John K5MO
___
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
for me)?
Awaiting further task assignments. I appreciate all the help.
73
Richard
- Original Message - From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Thursday, July 14, 2011 10:27 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
OK
assignments. I appreciate all the help.
73
Richard
- Original Message -
From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Thursday, July 14, 2011 10:27 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
OK. As others have said, we are missing
-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
73
Richard
- Original Message - From: Garey Barrell
k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Thursday, July 14, 2011 10:27 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
OK
- Original Message -
From: Donley donley...@comcast.net
To: k4...@mindspring.com; drakelist
Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 7:29 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Garey , Richard I, et al
Since I am the student here, I can only be Richard II
Richard Knoppow wrote:
- Original Message - From: Donley donley...@comcast.net
To: k4...@mindspring.com; drakelist
Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 7:29 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Garey , Richard I, et al
Since I am the student here, I can
...@mindspring.com; drakelist
Drakelist@zerobeat.net
Cc:
Sent: Thursday, July 14, 2011 2:24 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
- Original Message -
From: Donley donley...@comcast.net
To: k4...@mindspring.com; drakelist
Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 7
, July 13, 2011 1:42 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard Knoppow wrote:
- Original Message - From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 6:19 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard
To: k4...@mindspring.com; drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 10:26 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
- Original Message - From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 6:36 PM
Subject
I have had two separate issues with this switch. Deoxit and working back and
forth a few times solved it.
73
Mark
N5KAE___
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
...@mindspring.com; drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 10:26 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
- Original Message - From: Garey Barrell
k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 6:36 PM
Subject: Re: [Drakelist] TR
- Original Message -
From: Curt Nixon cptc...@flash.net
To: Donley donley...@comcast.net
Cc: Richard Knoppow 1oldle...@ix.netcom.com;
k4...@mindspring.com; drakelist Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 9:43 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
...@mindspring.com; drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 10:26 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
- Original Message - From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 6:36 PM
Subject: Re
*From: * Garey Barrell k4...@mindspring.com;
*To: * drakelist Drakelist@zerobeat.net;
*Subject: * Re: [Drakelist] TR-4C Bias Adjustment
*Sent: * Wed, Jul 13, 2011 1:19:27 PM
Richard -
I hate losing all our previous information on this message... My fault
Richard Knoppow wrote:
- Original Message - From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 6:19 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I don't recall a C73 reference.? Possibly C74, which
Garey Barrell wrote:
Richard Knoppow wrote:
- Original Message - From: Garey Barrell
k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 6:19 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I don't recall a C73 reference
-4C Bias Adjustment
Richard Knoppow wrote:
- Original Message - From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 6:19 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I don't recall a C73 reference.? Possibly
Drakelist@zerobeat.net
Sent: Saturday, July 09, 2011 3:00 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I've thought about this some more this afternoon, and I think the next
step is to measure the PA voltages with the switches set per the manual
and see WHAT is missing.
There aren't
- Is the bias current just plate current with no transmitter gain?
Thanks.
Richard
kc9ub
- Original Message - From: Garey Barrell k4...@mindspring.com
To: Donley donley...@comcast.net
Cc: Drakelist Drakelist@zerobeat.net
Sent: Friday, July 08, 2011 11:18 PM
Subject: Re: [Drakelist] TR-4C
- Original Message -
From: Donley donley...@comcast.net
To: k4...@mindspring.com; drakelist
Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 8:57 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Garey,
Sorry about the delay in my response. Time gets away from
me.
I acquired
From: Donley donley...@comcast.net
To: k4...@mindspring.com; drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 10:57 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Garey,
Sorry about the delay in my response. Time gets away from me.
I acquired the TR-4C several years ago and my
*Subject:* Re: [Drakelist] TR-4C Bias Adjustment
Garey,
Sorry about the delay in my response. Time gets away from me.
I acquired the TR-4C several years ago and my normal procedure is to put a new acquisition on the
bench and run it through a simple use test. Then I tag it with the information, working
From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 12:57 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Kihwal -
I agree with most of what you said. The Screen voltage is slightly low, most
likely as a result
:* Garey Barrell k4...@mindspring.com
*To:* drakelist Drakelist@zerobeat.net
*Sent:* Tuesday, July 12, 2011 12:57 PM
*Subject:* Re: [Drakelist] TR-4C Bias Adjustment
Kihwal -
I agree with most of what you said. The Screen voltage is slightly low, most likely as a result
of leakage in the AC-4
*From:* Garey Barrell k4...@mindspring.com
*To:* drakelist Drakelist@zerobeat.net
*Sent:* Tuesday, July 12, 2011 12:57 PM
*Subject:* Re: [Drakelist] TR-4C Bias Adjustment
Kihwal -
I agree with most
. because that is the only antenna
that I currently have in place.
I will gladly take on more chores to find a fix.
Richard
- Original Message - From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 3:57 PM
Subject: Re: [Drakelist] TR-4C
- Original Message -
From: Donley donley...@comcast.net
To: k4...@mindspring.com; drakelist
Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 4:25 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Garey,
I have gone through my list of task assignments and have
some results
- Original Message -
From: Donley donley...@comcast.net
To: k4...@mindspring.com; drakelist
Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 4:25 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Another thought, If the meter switch is stuck reading
output rather than plate
antenna that I currently have in
place.
I will gladly take on more chores to find a fix.
Richard
- Original Message - From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 3:57 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
donley...@comcast.net
To: k4...@mindspring.com; drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 4:25 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Another thought, If the meter switch is stuck reading output rather than plate current its
likely the adjusting pot will work, that's
Assuming that the spring is not broken!
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
William Lambing wrote:
My load switch is a PUSH switch ... it does not pull. You push in for RF output indications ...
left alone
- Original Message -
From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 6:36 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
This is what I referred to in my last message. There is
no adjusting pot on the TR-4C
Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 10:26 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
- Original Message -
From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 6:36 PM
Subject: Re: [Drakelist] TR-4C Bias
- Original Message -
From: Donley donley...@comcast.net
To: Richard Knoppow 1oldle...@ix.netcom.com;
k4...@mindspring.com; drakelist Drakelist@zerobeat.net
Sent: Tuesday, July 12, 2011 8:05 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Completed tasks.
Adjusted bias control
-
From: Garey Barrell k4...@mindspring.com
To: Donley donley...@comcast.net
Cc: Drakelist Drakelist@zerobeat.net
Sent: Saturday, July 09, 2011 3:00 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I've thought about this some more this afternoon, and I think the next
step
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I'm not sure I follow your description below.
1. There is only ONE metering circuit, NO switching involved. If it can read PLATE current it
can also read BIAS current.
2. 26 V across the relay sounds low, but if it pulls in that can
current with no transmitter gain?
Thanks.
Richard
kc9ub
- Original Message - From: Garey Barrell k4...@mindspring.com
To: Donley donley...@comcast.net
Cc: Drakelist Drakelist@zerobeat.net
Sent: Friday, July 08, 2011 11:18 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard
Richard -
I'm not sure I follow your description below.
1. There is only ONE metering circuit, NO switching involved. If it can read PLATE current it can
also read BIAS current.
2. 26 V across the relay sounds low, but if it pulls in that can be left til
later.
The manual says to switch
Cc: Drakelist Drakelist@zerobeat.net
Sent: Friday, July 08, 2011 11:18 PM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I'm not sure I follow your description below.
1. There is only ONE metering circuit, NO switching involved. If it can
read PLATE current it can also read BIAS
Bill -
I'm guessing here, since you didn't specify. Do you mean when you key
the transceiver you have NO PLATE current, or LOTS of PLATE current???
Assuming you have NO PLATE current, which is most likely, consider that
the PA tube normally want to draw as much current as possible when
What does the PA current read with the RF gain at zero and the PTT
switched to transmit?
If it is high, then that might suggest an issue with the circuitry at
the finals. Hard to guess if it is low and not adjustable.
Curt
KU8L
Billy Loyd wrote:
I have a TR-4C that I cant set the bias
Kihwal -
Check Pin 2 of V17 for resistance to ground (270 Ohms) and voltage ~7.5 VDC.
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
Kihwal Lee wrote:
My TR-4C's s-meter points to S-9 under no signal condition.
It's 290 ohm and the following are the voltage levels.
pin1 0.2v
pin2 12v
pin5 237v
pin6 246v
Probably I should check the R's around the meter as the pin6 voltage seems a
bit high. Any other suggestion?
Thanks
Kihwal K9SUL
On Apr 14, 2011, at 2:29 PM, Garey Barrell k4...@mindspring.com
Kihwal -
OK. Most likely problem is a leaky C212. That Cathode (pin 1) voltage
is way too high. the stage is drawing ~42 mA rather than the 28 mA it
should be. Check R185, and disconnect C212. The Cathode voltage should
drop to around 7.5 VDC. R92 is about 7% high, so in tolerance, but
Hi Don,
Some guy had a bunch of mic elements a short while ago on eBay that he
claimed were replacements (albeit physically smaller) for the crystal
cartridges inside the D-104...
They were priced right, too, as I recall (a single digit)---but they looked
like the old made-in-Japan-type of mic
Don,
I use Shure 444D microphones with my Drakes and have always received good
reports.
Wyatt
On Mon, Feb 28, 2011 at 12:38 PM, Don Miller k4...@hotmail.com wrote:
Hi group,
My crysral element went bad in my old D-104. What would you recommend to
replace it and have good transmit audio
I use a sure 444 and it works fine.
My friend w2eny sells replacement mic elements for the d104 google him.
George ne2i
On Feb 28, 2011, at 1:38 PM, Don Miller k4...@hotmail.com wrote:
Hi group,
My crysral element went bad in my old D-104. What would you recommend to
replace it and
Dick -
Congratulations! Always nice when one 'behaves' again :-)
The TR-4C works a little differently in CW/TUNE than the T-4X(any).
Essentially the Carrier Oscillator is shifted by about 800-900 kHz to put it within the passband of
the LSB filter. A 750 ohm resistor (R72) is inserted
Joe -
If you check the schematic, you'll see that the resistor is a Test Point
for adjusting the BAND oscillator per section 5-10 of the manual.
So yes, it goes 'no where'! :-)
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs
www.k4oah.com
joe
Joe,
If the switch has not been abused, cleaning the contacts should
restore it to 100%. A little bit of Caig DeOxit followed by
exercising the switch will probably remove any built up oxidation.
The RF Output issue could be soft final tubes or the driver tube.
Which band you're getting 65 W
Joe,
On the TX power level. Check to make sure you have correct voltages on the
AC4. Does the AC4 work well on another rig? Also have a look at your bias
setting. Too much toward Class A lowers your output. Then of course check
the output at 10M vs 80M. The tubes tend to soften earlier on
Loren -
It's highly unlikely that BOTH PTOs would develop the jitters at the
same time, so the problem is probably elsewhere. Does this occur on ALL
bands, in particular both 80M and 40M for example?
IF it appears on BOTH 80M and 40M, then my next suspect would be the
contacts of relay K2.
Hi Garey,
I will have to try what you are suggesting and see if the instability is
localized to 40m (where I am mostly), or is on the other bands. Will
let you know.
As to how I am determining it, I am mostly on digital modes (mainly
PSK31) and I am seeing the jumps when viewing the
just FYI,
I took the TR-4C back to my work bench and looked it over again out of
the case. Saw nothing, then I tried it on my spare AC4 (both AC4s have
been rebuilt btw) and found no issues, took it back to the shack and
tried it again and now all is functioning again. Have no idea.
Still
Did you spray a lot of some sort of spray cleaner on the switch contacts and
all over the tube socket pins? If you did, you could have set up leakage
paths over insulation.
Lee, w0vt
- Original Message -
From: Loren McCullough loren...@verizon.net
To: drakelist
BAHR
Cc: drakelist
Sent: Sunday, May 30, 2010 10:11 PM
Subject: Re: [Drakelist] TR-4C issues
No, hasn't been cleaned like that in many years. I should mention the
maintenance I was doing was cosmetic, not electrical/mechanical.
Loren - WA3WZR
On 5/30/2010 11:08 PM, LEE BAHR wrote
:11 PM
*Subject:* Re: [Drakelist] TR-4C issues
No, hasn't been cleaned like that in many years. I should mention
the maintenance I was doing was cosmetic, not electrical/mechanical.
Loren - WA3WZR
On 5/30/2010 11:08 PM, LEE BAHR wrote:
Did you spray a lot of some sort
Ken,
Drake stopped installing tubes shields on those tubes a long time ago. The
TR-4C never had them installed.
73, Gary W8PU
http://home.roadrunner.com/~w8pu
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Drakelist@zerobeat.net
Hi Paul:
Regarding the fan. I have used fans on my A and B series and am
installing in the TR's now. A standard 80mm square fan will fit
perfectly on the back of the final cage. While you will get advice
suggesting both directions of air, I think the best is to have it
drawing air OUT of
C-145 is under attack on general principles of age. The birth certificate
shows the date of September 21, 1973. This device needs to be replaced before
it causes all sorts of problems. A gassy tube had crossed my mind but this one
still glows a nice warm orange. Past experience is that a
Paul -
Gassy tubes don't always glow blue.. When enough cathode material
deposits itself on the grid, the grid begins to emit electrons, causing
the grid to go more positive. Called gassy, but really grid
emission. End result is when the grid gets hot enough to emit, the
grid goes
Paul,
Go to www.hayseedhamfest.com and check Tom's site. I think he is out of the
TR4C caps right now, but is tooling up to produce all the parts in house and
will be back on line soon. You might get on the list, hi. He builds VERY high
quality multiple capacitor cans and has reasonable
The TR-3/4 series transceivers are not usable on any but the original
five bands. The Noise Blanker is quiet rare, and typically sells for
$150-200 IF found.
The 4 Series Twins ARE usable on any frequency between 1.5 and 30 MHz
(except for a narrow range between 5 and 6 MHz and another
Thanks for the info, I'll pass on that then, I'll stick with the twins,
73 Max
--
I am using the free version of SPAMfighter.
We are a community of 6 million users fighting spam.
SPAMfighter has removed 2085 of my spam emails to date.
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Loren -
Congratulations! Cold or cracked solder joints are all too common in
gear this old. Finding them is not always easy!
Yeah, that's too bad. Finals are not getting any cheaper. Those RCAs
should last another 25 years as long as you don't try for 10 minutes to
load them into the
Loren,
I've been following this thread and am glad to read that you found the
problems.
FWIW, I had a similar problem with a TR-4C last year. Finally found a
buried connection on a terminal strip that was never soldered! Seems that the
mechanical connection alone got it past QC and
Just to be sure we are not diagnosing the wrong problem
here. When I say the S-meter goes up, it is really the entire
receiver that is affected, it's like a strong signal is being received
and nothing else can be heard.
WA3WZR
___
Drakelist mailing
Loren -
Sure sounds like the RCVR K line (cathodes of V3, V7, V11 and V12) is
not being grounded by the relay contact. The fact that tripping the PTT
a few times clears the problem also points to the relay contacts. This
a normally closed contact, so not very much contact pressure, and so
Thanks for your advice Garey, will try to get to it this
weekend. It is getting worse and keying the mike is not fixing the
problem anymore. The thing is though, I replaced the relay in the
spring when I was doing some general maintenance on the rig, including
rebuilding the AC-4 and fixing the
Loren -
OK. One thought, even with a new relay... If the normally closed fixed
contact is bent up slightly, it may not be making good contact if the
other three normally closed contacts are a little lower.
The RCVR K contact is the only normally closed contact that should be at
chassis
The original relay was the PB one. I still have
it as spare parts. cleaned the contacts and put it back in.
did not solve the problem, so it's going to take some digging with a
voltmeter.
Loren - WA3WZR
At 11:11 PM 9/30/2009, Garey Barrell wrote:
Loren -
OK. One thought, even with a new relay...
...@zerobeat.net] On Behalf Of Garey
Barrell
Sent: Tuesday, September 15, 2009 3:13 PM
To: drakelist
Subject: Re: [Drakelist] TR-4C annoyance
Loren -
A full scale S-Meter is typical of a receiver in Standby, or in the
case
of the TR series, when it's switched to transmit. Standby in
the
transceiver can
Loren -
A full scale S-Meter is typical of a receiver in Standby, or in the case
of the TR series, when it's switched to transmit. Standby in the
transceiver can be approximated by turning the RF GAIN full CCW. Does
the S-Meter go to the same reading in both Standby and fault conditions?
-Original Message-
From: drakelist-boun...@zerobeat.net
[mailto:drakelist-boun...@zerobeat.net] On Behalf Of Garey Barrell
Sent: Tuesday, September 15, 2009 3:13 PM
To: drakelist
Subject: Re: [Drakelist] TR-4C annoyance
Loren -
A full scale S-Meter is typical of a receiver in Standby
goes on. Try replacing the 12AX7.
Regards,
KD8CN
-Original Message-
From: drakelist-boun...@zerobeat.net
[mailto:drakelist-boun...@zerobeat.net] On Behalf Of Garey Barrell
Sent: Tuesday, September 15, 2009 3:13 PM
To: drakelist
Subject: Re: [Drakelist] TR-4C annoyance
Loren
intermittently
and
becomes worse as time goes on. Try replacing the 12AX7.
Regards,
KD8CN
-Original Message-
From: drakelist-boun...@zerobeat.net
[
mailto:drakelist-boun...@zerobeat.net] On Behalf Of Garey
Barrell
Sent: Tuesday, September 15, 2009 3:13 PM
To: drakelist
Subject: Re: [Drakelist] TR-4C
Loren -
You may also have a dirty relay contact. One pole of the relay grounds
the RCVR K, which grounds the receiver cathodes in the Normally Open
contacts. If this contact is dirty, it could also cause what you are
seeing. You can carefully pry off the relay cover and clean the
contacts
Loren -
The S-meter current is derived from a bridge that compares the plate
current drawn by V4, V11 and V15 with the current drawn by V17.
From your description, I'd check the cathode resistor and cathode
bypass of V17.
73, Garey - K4OAH
Loren McCullough wrote:
Lately, my TR-4C has
Thanks for the info. C145 does not appear to be
shorted in any of the 4 segments. I am suspecting the power supply
at this point. Using WB0IQK's trouble shooting as a guide here is
what I am seeing:
pin #10 - 710 volts DC, 100mv AC
pin #11 - 285 volts DC, 100mv AC
pin #4 - abt 14Volts AC
pin
Loren -
Those numbers look ok, with the exception of the Bias, as you are
looking at unloaded voltages. Pin 10 will drop to about 650 under
load of 350 mA, Pin 11 will drop to about 260V under load of receive
mode, and Pin 4 will be about 12.6 VAC _at the tube sockets_. The
Bias voltage
It's 27 ohms (RED-VIOLET-BLACK).
Lee, w0vt
- Original Message -
From: Loren McCullough loren...@verizon.net
To: drakelist drakelist@zerobeat.net
Sent: Sunday, April 05, 2009 7:57 PM
Subject: [Drakelist] TR-4C resistor identification help
I just had a resistor on the relay board
Loren -
It's 27 ohms. It's also a _fuse_ indicating that there is a problem
on the +250V bus in the TR-4C. Most likely a shorted electrolytic and
if no other resistors are burned, probably the 20 uF section of C145,
the can electrolytic.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B,
Lee -
You probably know this, but those two crystals were options in the
TR-4C. They were standard in the TR-4, but were deleted, probably as a
cost-cutting measure.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs
www.k4oah.com
LEE BAHR wrote:
Well
Sent: Monday, December 08, 2008 8:24 PM
Subject: Re: [Drakelist] TR-4C
Well, I never learn. I saw a TR-4C with a nice front panel, no cabinet
screws, missing one small knob, no relay, burned out 1/2 watt resistor on
relay board, missing 7 small tubes, missing two crystals, and no pilot
lamps
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