Hey there TB'ers.
I wanted to give a high-five for Shane Manning at TubeSonic (http://www.tubesonicamps.com
) in Sacramento.
Shane is a one-man shop. He is a tube amp guru who works on all-tube amps (any brand), bringing them back to top notch performance.
I recently had him go through all three of my vintage Ampeg all-tube amps (an SVT-II nonpro, a V-4B, and a B25B). All three amps are now working PERFECTLY!
I have no affiliation with Shane. I'm just a very happy customer of his, and for those of you with all-tube amps seeking a very knowledgeable and honest tube amp repair tech in northern California, I highly recommend Shane!