Help!
- Original Message -
With no incoming signals, including crystal calibrator, and with C-130 adjusted
for equal sounding white noise when switching between
Lower and Upper I am unable to zero the S-meter in both sidebands. It will
zero with one or the other and then the
curves for the filters.
Kind of scares me when you consider new filters will cost around $130 each and
you need two of them!
Lee, w0vt
- Original Message -
From: k7...@comcast.net
To: drakelist drakelist@zerobeat.net
Sent: Monday, February 24, 2014 12:35:58 PM
Subject: [Drakelist] TR
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
Am struggling with adjustment of C-130 for equal pitch of noise w/ the LSB and
USB front panel switch per the manuals 9 MHz oscillator adjustments - Section
5-9. Adjusting C-130 also seems to affect S-meter zero in USB and LSB.
My other xcvr, a TR-4CW/RIT, also appears to behave the same
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
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,
joe k7mks
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Thanks for your time. I would like to get $300.00 for the set.
TR4-C
AC4-D supply
MS-4 speaker
This radio also has the HV cap replacement mod partly installed and working.
Voltages appear to be good.Mainly cosmetic . Also appears to have a
dirty band switch.
73 de WB9AUJ
John Vodenik
Hi, all:
I should do a better job of proofreading before pressing the Send button! The
summary of the changes should have referenced R135 (not R133) in the both cases.
I apologize if there was any confusion.
73,
Bob K9JU
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Drakelist mailing list
Hi All,
Need a top for the PA finals cage and a new Plate
control shaft for a TR-4C.Anyone have one to spare ?
73 es thanks,
Gene K1NR
-
Web mail provided by NuNet, Inc. The Premier National provider.
http://www.nni.com/
_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
S-Meter is now working better and RX sensitivity is better after poking and
tighting. I think the relay or fuse lamp socket was not making good
contact. Tightened a bunch of screws.
S-Meter only goes to half scale in XMIT. I found this problem on and R4b
and found what I did on it a few years
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
: jeffers...@xtra.co.nz jeffers...@xtra.co.nz
Subject: [Drakelist] TR-4C Filament Voltage
To: drakelist@zerobeat.net
Date: Sunday, October 9, 2011, 11:12 PM
The filament voltage on my TR-4C is just under 6V at the tube filament pin.
The Drake AC-4 is wired for 120/240V, but the Line Voltage
transformers.
73,
Bob AD3K
From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net]
On Behalf Of jeffers...@xtra.co.nz
Sent: Sunday, October 09, 2011 11:12 PM
To: drakelist@zerobeat.net
Subject: [Drakelist] TR-4C Filament Voltage
The filament voltage on my TR-4C
Of jeffers...@xtra.co.nz
Sent: Sunday, October 09, 2011 11:12 PM
To: drakelist@zerobeat.net
Subject: [Drakelist] TR-4C Filament Voltage
The filament voltage on my TR-4C is just under 6V at the tube filament pin.
The Drake AC-4 is wired for 120/240V, but the Line Voltage in New Zealand is
230V
The filament voltage on my TR-4C is just under 6V at the tube filament pin.
The Drake AC-4 is wired for 120/240V, but the Line Voltage in New Zealand is
230V.
Hence, I presume, this is the reason for lower filament voltage, and probably
lower HV on the plates.
I suppose this means lower
: 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
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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___
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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
: [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 that many choices, ONE or more of the three are missing or
incorrect
- 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
My load switch is a PUSH switch ... it does not pull. You push in for RF
output indications ... left alone for normal cathode current.
Also, lights ... on mine ... 40M Sideband X = LSB.
80M Sideband X = is USB .. you need to switch to the left (non-X) position for
LSB.
Bill, W0LPQ
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
A few weeks ago I started working on putting a TR-4C back on the air. I posed a
question about the bias adjustment. I finally got back to working on the
transceiver and still have some questions. I have followed all the information
that has been sent to other people with bias problems, but that
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
I have pulled a TR-4C off the shelf, blown off a little dust and am trying to
get it ready to put on the air. I know that I will have more questions but I
want to start with the most important. When I try to adjust the bias current, I
get no change in the current as I adjust the potentiometer.
I have a TR-4C that I cant set the bias on. When adjusting the bias control on
the power supply it has no effect on the radio. I have 2 power supplies and
both
have no effect. I can remove the bottom cover from the supply and set the bias
to the proper - voltage using my volt meter but it does
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
My TR-4C's s-meter points to S-9 under no signal condition. Adjusting the
sensitivity and the zero pot won't correct it. I also noticed its reduced
sensitivity compared to other Drakes that I have. The s-meter moves as expected
when RF gain is lowered. Checked/replaced all tubes. I also checked
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 group,
My crysral element went bad in my old D-104. What would you recommend to
replace it and have good transmit audio with my TR-4C.
Thanks, Don ___
Drakelist mailing list
Drakelist@zerobeat.net
: [Drakelist] TR-4C Microphone
Hi group,
My crysral element went bad in my old D-104. What would you recommend to
replace it and have good transmit audio with my TR-4C.
Thanks, Don
___
Drakelist mailing list
Drakelist@zerobeat.net
http
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
Hello Drake List Members,
I was doing some visual inspection of the bottom chassis of my TR-4C tonight
and noticed an anomaly that I was hoping to get some guidance on.
On pin 9 of tube V1 there is a 1meg resistor sticking up through a hole in
the chassis (near the PNB-34 blanker circuit) that
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
.
73,
Ron WD8SBB
--- On Tue, 9/7/10, Joe Loverti joelove...@gmail.com wrote:
From: Joe Loverti joelove...@gmail.com
Subject: [Drakelist] TR-4C RCV / XVCR switch
To: drakelist@zerobeat.net drakelist@zerobeat.net
Date: Tuesday, September 7, 2010, 8:58 PM
Hello Drake List Members,
I have a TR-4C w
Thanks Everyone for your responses and information. Mr. Frost, I
just may want to buy one of those switches from you. Do you have any
idea on a proper way to mount it? The original is riveted into the
chassis, so I'm a little concerned about how the case will fit.
As far as the tx is
Hello Drake List Members,
I have a TR-4C w/ a few gremlins I'm trying to iron out. Was hoping
someone may be able to point me on the right direction.
The RCVR / XCVR switch on the lower left-hand side of tbd chassis is
bad. Does anyone know of a scource for a replacement? I have to hold
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
What factors could contribute to frequency instability EXTERNAL to the PTO?
My TR-4C has just developed a jittery frequency, jumping back and
forth around center freq by as much as 50Hz. I know someone (if not
many) will refer me to the excellent articles on PTO rebuilds, but
before someone
Was just putting my TR-4C back in service after having done some minor
maintenance on it, now I am having some issues and need some assistance.
Here are the symptoms:
was tuning it up on 40m and could only get a maximum of about 80 watts
out of it. I started going to different bands to check
@zerobeat.net
Sent: Sunday, May 30, 2010 9:59 PM
Subject: [Drakelist] TR-4C issues
Was just putting my TR-4C back in service after having done some minor
maintenance on it, now I am having some issues and need some assistance.
Here are the symptoms:
was tuning it up on 40m and could only get a maximum
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
Even though I've had this TR-4C (#40249) about 2 years I've only just today
took the top cover off for a look. I noticed that the metal shields are
missing from V6 (12BY7A) driver and V12 (12BA6). Is this something I should be
concerned about? Where, if anywhere, can I find replacement
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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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
I acquired this TR-4C from my father a decade ago, W9LKZ (SK). I've rebuild
the power supply with great success a few years ago. Now I have a problem with
the xmtr keying circuit. After allowing the rig to warm up for half an hour or
so when I key the mic and then release it the transmitter
25, 2010 9:59 PM
Subject: [Drakelist] TR-4C Keying Problem
I acquired this TR-4C from my father a decade ago, W9LKZ (SK). I've rebuild
the power supply with great success a few years ago. Now I have a problem with
the xmtr keying circuit. After allowing the rig to warm up for half an hour
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