[Amps] (Fwd) Amp tube pin/socket de VY1JA

[Vic K2VCO]

Tom W8JI wrote:

>> I noticed that the pin does not spring well against the 
>> pin and adjusting it
>> does not net a real improvement in pin/socket connection.
> 
> That could be a problem.

I have seen this problem myself. The problem is that once the pin and 
the contact start getting hot, the spring loses its temper, which 
increases the contact resistance, making the problem worse. Ultimately 
the solder in the tube pin melts.

I have fixed it by swapping the spring on the filament pin with one from 
one of the grid pins, which (we hope!) doesn't have to pass so much 
current. Much easier than replacing the socket.

I have resoldered the pins using silver-bearing solder of the type that 
will melt with a soldering iron set to 750 degrees f. I would be afraid 
to use solder that required a torch because of the seals.

I don't know what starts the cycle of heating, but of course you have to 
make sure the blower is working properly and there are no obstructions 
near the inlet.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco