[Boatanchors] DRAKE TR-3

[AD5VJ Bob]

I am in the middle of restoring a Drake TR-3 and so far everything is going well.

However, I have a question:

I have her receiving a cw signal right now on 14.025 or so, but the speaker volume seems low and the S needle is sitting at 20 over
nine in rx mode.

I cleaned the tube sockets with WD-40 and the wafer switches, but it didn't change anything. 

I am guessing I may have an AGC tube starting to go south, but dont have a tube checker to be able to tell.

I also have around a .05 reading steady reading on the plate current meter when it is in rx mode.

How can I tell if the tube is bad without a tube checker.

Bob AD5VJ