[Boatanchors] Gonset G-76 question and status report

[Jack Antonio]

About a month ago, I purchased a G-76 "parts radio".
When I got it home, I figured that it would be worth it
to try to get it back to operation.

So here is what I found so far, receiver operation was dead,
due to an open 100K screen resistor for the 6BZ6 RF amp. Not
cracked, discolored or burned, just open. Reciever works
good on 75, a little drifty on 40, no serious listening
on the other bands yet.

Transmitter turns out to have a few more problems, and
I'm wondering if these problems are what caused the
radio to be relagated to a parts unit.

Problem is unstable power output on transmit, with
arcing in the neutralizing and grid tuning capacitors
on unkey. Only when warm, for the first few minutes
after turn on, all seems OK. 80 watts out, PA plate current
OK. Then after a few minutes, you key it, an unstable
50 watts out, and arcing on unkey. I found that the
PA tuning cap needing replacing, as the rotor had shifted,
reducing the plate spacing, but replacing that did not
help matters.

Still doing trouble shooting but I have a few questions.

1. What is the value of the resistor from the PA screen to
ground? This radio has the 12AQ5 and 0B2 clamp circuit.
The radio has a 22K 2W resistor in it now.

2. What is the value of the grid tuning cap?
(Some of the values on the schematic I have are a bit fuzzy).

Thanks

Jack Antonio WA7DIA
scr287 at sbcglobal.net