[RichG]

Just another update.  Because of several tubes that were DOA, I started to check the power transformer windings for the correct ohm readings.  When I checked the HV secondary, my VTVM showed the hallmark reading of a leaky capacitor charging.  This should not happen as the HV secondary is isolated from the filter circuit.  I did some poking around the rectifier socket and found a burn mark.  When I poked at the burn, my probe went through the phenolic right between the plate connections for the 80 rectifier.  I suspect the burn allowed a path to the filament connection, which would allow a connection to the filter circuit.  Anyhow, since the socket has to be replaced, it seems better to replace it with an octal socket and replace the 80 with a 5Y3.  Any advice as to the type of octal socket, ceramic, plastic?  I may be able to get an octal socket from my local Vetco Electronics.
It looks as though someone replaced the line cord at some point.  Not sure, but I don't think it was done correctly and that, coupled with a leaky filter capacitor may have caused arcing that burned the socket.  I will be checking the other sockets for burn marks. 
Thanks!
Rich

[Chas]

Ceramic 4-pin for an 80. The wider spacing of the pins still remains helpful.

Do confirm the transformer is good by operating it without load, socket leads insulated. If it does not overheat in 1/2 hour, good...

Chas

[RichG]

Hi Chas,
I didn't know that the older 4 pin sockets were still available. I'll have to do some looking at various suppliers.  I thought a ceramic socket would be the better choice.  Since all the tubes have been removed, I can test the transformer under no load conditions.  I'll isolate the transformer primary so nothing else gets energized. I'll use my variac (AKA Adjust-A-Volt) to bring it up slowly just to make sure there are no other problems.
Thanks for the info.
Rich

[GarySP]

Ebay has several choices under "4 pin tube socket". Take care and BE HEALTHY! Gary

[Chas]

The "Variac" is fine or a "dim bulb" (100) watts), works too as it is evident that some high temps once existed. Will need a 1/2 hour at full voltage to access if there is low level short, Be SURE that pilot lamp sockets are not shorted. Transformer should be just slightly warm, no crackling, sizzling sounds.

Measure the distance between the rivets to find a socket that has matching holes. Use fiber washers under the nuts so not to strain porcelain. Bugger the ends of the threads with diagonals in event the hardware ever loosens the nut won't get by the spoiled threads...

I have some used porcelain 4-pin if you can't find the spacing. Or drill new holes. Some, old school sockets had an extra springs to grip the terminals... Transmitter tube sockets...

GL

Chas