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
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Message: 3
Date: Mon, 8 Feb 2010 18:30:25 -0500
From: Paul Gerhardt <<mailto:phgerha...@gmail.com>phgerha
ting. So any help there is
> >> appreciated.
> >
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> >
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>
> --
> The
OK I did some more checks today and this is what I see. With the Transceive
in Separate and INJ cable hooked up I can hear the Transmiter VFO in the
Receiver and I can still adj the Idle current (although the idle goes up
another needle width when the relay closes) I turned it over and tried
pokin
Paul -
Make sure that the TRANSCEIVE switch is in SEPARATE and the MODE switch
is in SSB. Are you SURE the relay is dropping out? If these are
correct, pull V11 out of the socket. A heater-cathode short in this
tube will keep the transmitter keyed.
Check the relay carefully. It is possib
100+ watts out but T4 not going fully to standby mode.
Idle current is ok same as before but it is still 'idling' with the TR relay
in Receive. I can hear 'noise' in the receiver especially with the INJ
cable plugged in.
Not all the damage has been discovered.
Today I did find a short in one of t
Paul -
OK. See below.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
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 w
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
auto parts
store OR will use the single strand of wire from the zip cord. Then will
pull tubes and try the 250 v line again.
Paul
Message: 5
Date: Fri, 05 Feb 2010 18:09:34 -0500
From: Garey Barrell
Subject: Re: [Drakelist] T4XB No +250V AND blown Filament Fuse
To: drakelist@zerobeat.net
Paul -
I realized I used the wrong number for the "fuse" wire. I actually use a single strand of 18-2 ZIP
cord, which I think is #33.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
Paul Gerhardt wrote:
OK and thanks to all. I just got back home a
Paul -
Couple of things. One, be careful using a larger fuse than the 8 Amp
original. That fuse is to protect the wiring harness in case of a
filament short. Melted harness = parts radio. The early units used a
piece of #30 wire instead of a fuse.
There aren't many places in the transmit
OK and thanks to all. I just got back home and am going to try the T4Xb
troubleshooting again this weekend. Will pull the finals and see if that is
what is pulling the 250 B+ down. The R3 was in the AC4 sorry for not noting
this before. I looked at the old one and the schematic and was reading
kelist@zerobeat.net
Subject: Re: [Drakelist] T4XB No +250V AND blown Filament Fuse
Paul -
I just got a chance to look at the T-4XB schematic. R3 is NOT a 1k 5W
resistor, at least on my schematics!
Where is this resistor in your unit? Physically and on the schematic.
73, Garey - K4OAH
Glen Allen,
Paul -
I just got a chance to look at the T-4XB schematic. R3 is NOT a 1k 5W
resistor, at least on my schematics!
Where is this resistor in your unit? Physically and on the schematic.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
Paul Gerhardt w
Paul -
Finals are certainly suspect. Pull both Final tubes and see what
happens to your resistance measurement.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
Paul Gerhardt wrote:
Turned on my Working T4Xb and smoke came out the bottom of the rig
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
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