Here's a tweak tip: Caig De-Oxit

[Keim]

I'd heard about this stuff for years, but never tried it until a month ago.  I bought some and sprayed it on all connections, including tube pins and sockets.  What a difference it made on my Bottlehead Gear!  Easily the best bang for the buck tweak I've found in years.

 

[Grainger49]

Caig sells a small bottle of the liquid.  That and a small brush, very small, cleans the tube pins well without the overspray that the spray can gives. 

It is, of course, more expensive that way but will last much longer.

 

[Keim]

I'll remember that tip.  The improvement was like putting my amp on steroids.  Make that stereo-oids.  Very noticeable.