"VE3AX" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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HI all;
Been a while since I needed the technical services of this group but after
an evening of searching I am still buffaloed.
I have a late serial T4XC that goes into transmit mode c/w sidetone as soon
as the mode switch is placed in the CW position. AM & SSB positions are
fine but on CW the rig keys up with or without a key in the key jack. There
is no CW output until you close the key contacts.
Tube substitution of V-10 and the VOX preamp tube do not help.
All 5 diodes on the CW line and VOX circuit were replaced with new ones. (I
know, I know, this is not "troubleshooting" - I had a box of 1N4148's!)
This is a 6FQ7 Vox tube version. All voltages are within spec on the tube
pins and all resistances are on spec for this version (per Garey Barrell's
VERY useful C-Line Technical CD) with the single exception of pin 7, the
grid of V-10B. I am getting 1 megohm instead of 2 megohms. Guess more
checking of resistor values in that area is required.
Anyone else solve a similar experience and can shorten my bench time?
Thanks in advance!
Peter
VE3AX
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