OK T4XB is working now. Finally (with lots of help) and Thanks to the
group found a shorted Cathode to Filament in V1 which was causing the
'Tranmit Line' to turn on when it was supposed to be in
Standby/Rcvr. Just made a contact with it and got a good report. Still
have RF output a bit low but I think will leave it alone this time...
THANKS!!!
Paul K3PG
some rig pix and snow at:
<http://pgerhardt.blogspot.com>http://pgerhardt.blogspot.com
On Tue, Feb 9, 2010 at 12:00 PM,
<<mailto:drakelist-requ...@zerobeat.net>drakelist-requ...@zerobeat.net> wrote:
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Today's Topics:
1. Re: Cleaned the TR-4 (Garey Barrell)
2. Re: Cleaned the TR-4 (Richard Palmer)
3. Re: T4XB No +250V AND blown Filament Fuse (Paul Gerhardt)
4. Re: T4XB No +250V AND blown Filament Fuse (Garey Barrell)
5. ECL counter IC source? (Curt Nixon)
6. Re: MC10138 ECL counter IC source? (Gary Poland)
----------------------------------------------------------------------
Message: 1
Date: Mon, 08 Feb 2010 15:56:42 -0500
From: Garey Barrell <<mailto:k4...@mindspring.com>k4...@mindspring.com>
Subject: Re: [Drakelist] Cleaned the TR-4
To: <mailto:drakelist@zerobeat.net>drakelist@zerobeat.net
Message-ID:
<<mailto:4b707a8a.6080...@mindspring.com>4b707a8a.6080...@mindspring.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Richard -
The S-Meter is Zero'd with the cleverly disguised ZERO control on the
right side of the chassis.!! :-)
Disconnect antenna, detune RF TUNE control, and adjust ZERO control for
S1 on the meter. There is no S0 on Drake meters!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<<http://www.k4oah.com>www.k4oah.com>
Richard Palmer wrote:
>
> There is on thing that is not spelled out. Zeroing the meter. I
> cleaned all the pots and when I went to zero the meter I found nothing
> to help me determine the proper setting. So any help there is
> appreciated.
------------------------------
Message: 2
Date: Mon, 08 Feb 2010 18:06:42 -0500
From: Richard Palmer <<mailto:burnto...@toast.net>burnto...@toast.net>
Subject: Re: [Drakelist] Cleaned the TR-4
To: <mailto:k4...@mindspring.com>k4...@mindspring.com
Cc: <mailto:drakelist@zerobeat.net>drakelist@zerobeat.net
Message-ID: <<mailto:4b709902.8000...@toast.net>4b709902.8000...@toast.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Gary,
Since I cleaned it I knew where it was. I noticed that the zero adjust
affected the meter's reading of the bias also ... so I wanted to get it
set correctly.
Thanks for your help,
Richard Palmer
Garey Barrell wrote:
> Richard -
>
> The S-Meter is Zero'd with the cleverly disguised ZERO control on the
> right side of the chassis.!! :-)
>
> Disconnect antenna, detune RF TUNE control, and adjust ZERO control
> for S1 on the meter. There is no S0 on Drake meters!
>
> 73, Garey - K4OAH
> Glen Allen, VA
>
> Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
> <<http://www.k4oah.com>www.k4oah.com>
>
>
> Richard Palmer wrote:
>>
>> There is on thing that is not spelled out. Zeroing the meter. I
>> cleaned all the pots and when I went to zero the meter I found
>> nothing to help me determine the proper setting. So any help there is
>> appreciated.
>
> _______________________________________________
> Drakelist mailing list
> <mailto:Drakelist@zerobeat.net>Drakelist@zerobeat.net
> http://mailman.zerobeat.net/mailman/listinfo/drakelist
>
>
--
The law, in its majestic equality, forbids the rich as well as the poor to
sleep under bridges, to beg in the streets, and to steal bread. -
Anatole France
------------------------------
Message: 3
Date: Mon, 8 Feb 2010 18:30:25 -0500
From: Paul Gerhardt <<mailto:phgerha...@gmail.com>phgerha...@gmail.com>
Subject: Re: [Drakelist] T4XB No +250V AND blown Filament Fuse
To: <mailto:drakelist@zerobeat.net>drakelist@zerobeat.net
Message-ID:
<<mailto:bf7299be1002081530r31c5a92du31bf76176f263...@mail.gmail.com>bf7299be1002081530r31c5a92du31bf76176f263...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
OK still troubleshooting but found 2 more clues....
I pulled all the tubes and the AC4 power resistor R3 in the 250V line is now
cool to touch and V is 260V with NO tubes in.
When OA2 is in place (only OA2) R3 is too hot to touch and V drops about
12V.
2nd Clue I finally found what smoked in the chassis. It was hiding under a
switch shaft in the RF compartment. The 'smoker' was R30 the 68 ohm 1/2
watt resistor on V5 (final)
So I think maybe the tube had a grid to fil short and took out both
circuits.
I am still not getting a spot signal. R3 is still too hot when OA2 is 'IN'
OA2 is blue not shure otherwise if it is good? Problem may be on the 150 V
line as that powers the VFO (I think).
Still have the tubes out.
Paul K3PG in 'snowy' MD
pix on <http://pgerhardt.blogspot.com>http://pgerhardt.blogspot.com
On Thu, Feb 4, 2010 at 11:31 AM, Paul Gerhardt
<<mailto:phgerha...@gmail.com>phgerha...@gmail.com> wrote:
> Turned on my Working T4Xb and smoke came out the bottom of the rig which I
> can't see for some reason. The filimant fuse (8A pigtail lead fuse
near the
> 3 big power resistors) is open so replaced that, then no 250 V B+ and found
> R3 1K 5 watt resistor to be open. Both of these were 'effect' and not
cause
> (I suspect). I changed R3 and got 150V and R3 is hot. Unhooked the yellow
> 250V wire to the rig and V is good about 270V. Turned power OFF and
> measured Resistance on yellow wire and it is low only about 150 ohms. Last
> thing is always suspect and for this the last thing I did a few days
ago was
> install some used FleaBay finals which worked ok it seemed but were very
> weak only about 60-70 watts out (maybe one was not working?) Put the
bright
> light on the bottom and compared to photo I took before and fail to 'see'
> any burned parts on the bottom but there was smoke and I think it was
from a
> hot wire and not a componet. Will probably change the finals back to the
> 'other' weak ones that were at least putting out 120W into the Cantenna and
> see what is pulling the 250V B+ line down.
> Any ideas on this one?
>
> 73
> Paul
>
>
>
>
> --
> Paul Gerhardt
> K3PG
> <http://pgerhardt.blogspot.com>http://pgerhardt.blogspot.com
> QRP ARCI 6674
> FP 274
>
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------------------------------
Message: 4
Date: Mon, 08 Feb 2010 18:47:59 -0500
From: Garey Barrell <<mailto:k4...@mindspring.com>k4...@mindspring.com>
Subject: Re: [Drakelist] T4XB No +250V AND blown Filament Fuse
To: <mailto:drakelist@zerobeat.net>drakelist@zerobeat.net
Message-ID:
<<mailto:4b70a2af.3070...@mindspring.com>4b70a2af.3070...@mindspring.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Paul -
OK. See below.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<<http://www.k4oah.com>www.k4oah.com>
Paul Gerhardt wrote:
> OK still troubleshooting but found 2 more clues....
> I pulled all the tubes and the AC4 power resistor R3 in the 250V line
> is now cool to touch and V is 260V with NO tubes in.
> When OA2 is in place (only OA2) R3 is too hot to touch and V drops
> about 12V.
The 0A2 will glow blue when it is working, and will have +150V across
it. 12V drop across R3 is a little high, but is about 1.5W dissipation,
assuming it is 100 ohms.
> 2nd Clue I finally found what smoked in the chassis. It was hiding
> under a switch shaft in the RF compartment. The 'smoker' was R30 the
> 68 ohm 1/2 watt resistor on V5 (final)
> So I think maybe the tube had a grid to fil short and took out both
> circuits.
I think that's where we started! :-)
> I am still not getting a spot signal. R3 is still too hot when OA2 is
> 'IN'
SPOT will not be present with V8 out of the socket.
Again, 12 V drop across R3 is ok, only 1.5W, and if the 0A2 is blue,
it's regulating. The +150 bus drives the PTO, BAND OSC and the screen
of the PreMixer, along with V1, V2 Screen and V3 screen. The PTO supply
should have about 11 V on it, at the "low" end of R64, 6k @ 5W.
> OA2 is blue not shure otherwise if it is good? Problem may be on the
> 150 V line as that powers the VFO (I think).
> Still have the tubes out.
> Paul K3PG in 'snowy' MD
> pix on <http://pgerhardt.blogspot.com>http://pgerhardt.blogspot.com
<http://pgerhardt.blogspot.com/>
>
>
>
> On Thu, Feb 4, 2010 at 11:31 AM, Paul Gerhardt
<<mailto:phgerha...@gmail.com>phgerha...@gmail.com
> <mailto:phgerha...@gmail.com>> wrote:
>
> Turned on my Working T4Xb and smoke came out the bottom of the rig
> which I can't see for some reason. The filimant fuse (8A pigtail
> lead fuse near the 3 big power resistors) is open so replaced
> that, then no 250 V B+ and found R3 1K 5 watt resistor to be
> open. Both of these were 'effect' and not cause (I suspect). I
> changed R3 and got 150V and R3 is hot. Unhooked the yellow 250V
> wire to the rig and V is good about 270V. Turned power OFF and
> measured Resistance on yellow wire and it is low only about 150
> ohms. Last thing is always suspect and for this the last thing I
> did a few days ago was install some used FleaBay finals which
> worked ok it seemed but were very weak only about 60-70 watts out
> (maybe one was not working?) Put the bright light on the bottom
> and compared to photo I took before and fail to 'see' any burned
> parts on the bottom but there was smoke and I think it was from a
> hot wire and not a componet. Will probably change the finals back
> to the 'other' weak ones that were at least putting out 120W into
> the Cantenna and see what is pulling the 250V B+ line down.
> Any ideas on this one?
> 73
> Paul
>
------------------------------
Message: 5
Date: Tue, 09 Feb 2010 09:04:26 -0500
From: Curt Nixon <<mailto:cptc...@flash.net>cptc...@flash.net>
Subject: [Drakelist] ECL counter IC source?
To: Drake Forum <<mailto:drakelist@zerobeat.net>drakelist@zerobeat.net>
Message-ID: <<mailto:4b716b6a.2090...@flash.net>4b716b6a.2090...@flash.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Good Morning:
I'm looking for a couple of ECL Bi Quinary Counter IC in Dip
package..used on the DR7 board.
MC10138
Anyone have a source for these where I might buy just 2?
Thanks
Curt
------------------------------
Message: 6
Date: Tue, 9 Feb 2010 11:41:39 -0500
From: "Gary Poland" <<mailto:gpola...@cinci.rr.com>gpola...@cinci.rr.com>
Subject: Re: [Drakelist] MC10138 ECL counter IC source?
To: <<mailto:captc...@flash.net>captc...@flash.net>, "Drake Forum"
<<mailto:drakelist@zerobeat.net>drakelist@zerobeat.net>
Message-ID: <d62e9cec77fb450298e635523d761...@dell4400>
Content-Type: text/plain; charset="iso-8859-1"
Curt,
I had the same issue a few years back and the only place that resonded
to my email inquiry only offered the MC10138FN surface mount style of
package. Most of the emails I sent out to parts venders either went
unanswered or the cost was rediculous. I soldered on small leads and
mounted the IC above the board. Here is the company that I bought them
from. I paid $56 for seven of them.......
Rochester Electronics
c/o Wendi Sabatino
10 Malcom Hoyt Drive
Newburyport, MA 01950
978 462-9332 X309
73, Gary
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End of Drakelist Digest, Vol 20, Issue 10
*****************************************
--
Paul Gerhardt
K3PG
<http://pgerhardt.blogspot.com>http://pgerhardt.blogspot.com
QRP ARCI 6674
FP 274
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