Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Recount the pins and/or check R17. This is a "keyed" cathode, which is
grounded through R17 (along with the cathodes of V1a, V2 and other keyed
stages) by a relay contact or the FUNC switch. So IF there really is
143V on Pin 7 with the transmitter keyed, R17 is open or disconnected.
73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual
<http://www.k4oah.com>
DW Holtman wrote:
DW Holtman <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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Hello,
I'm working on a T-4XB which has no output. The Power Supply had some
ripple of the 250 Volt output, so I rebuilt the Power Supply. Replaced
all of the lytics. Replaced the diodes with heaver duty 1N4007's.
Replaced the 2 conductor cord with a three conductur grounded cord.
Replaced the .01 noise caps with X1/Y2 discs and changed out the 1
watt bleeders with 2 watt resistors.
On the transmitter, I tested all tubes, changed out the only 2 paper
caps thqat I could find, and cleaned all switches, tube sockets etc.
Now there is still no output. Measuring voltages, I found that the
cathode of Tube V-3 on Pin-7 has 143 Volts DC on it. I know it cannot
work with more than a couple of volts on the cathode. Any
ideas/suggestions?
Thank you in advance for any help.
Best,
73's
DW Holtman
WB7SSN
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