[R-390] Things to know

[wli]

I'm going thru my 52 Collins 390A...

Following an earlier post from Roger R, I took the time to pull each tube and swab out the tube socket contacts with deOxit using a tiny dental brush ($4 for eight). Also swabbed out each m-BNC female cable end. 

Took a while, but what's time when you are unemployed?

What a difference! My carrier level meter jumped from 10dB to 60dB on a test  signal. Changed nothing before and after this simple cleaning. You just can not see see crud that might accumulate in a tube socket.

Just a thought....

W. Li