Re: Crate Vintage Club 50 Head
I use Caig, Deoxit D5 from tubesandmore.
Since I have a combo version it is a chore to change tubes. I love the way it sounds as-is so I have settled on the Sovteks and have been very happy. 12AX7s are relatively cheap though so if it is easy to change the tubes in the head version I would experiment more with this amp. I like the EI and Tung Sols.
Here's a friendly suggestion. Let me start from the premise that you are selling yourself short by sticking with the Sovtek EL84s. They sound decent, and they sound better in this amp than in any other application in which I have tried them. That said, I've run JJ, Ei and Tesla quads in these. Each sounded noticeably better than the Sovteks. Unfortunately, the JJ and the Ei quads each suffered casualties. One tube from each quad died a premature death, which I attribute to the VC50H's extreme plate voltages. To their credit, the Sovtek EL84s have held up where the others have not.
How do you get better tone with reliability? Answer: buy a matched quad of NOS Reflektor 6P14P-EV. They are surplus Soviet Union military tubes rated for 5000 hours of service life. They sound very, very good in these amps. I was so impressed the first time I stuck a quad of these in a VC50H that I went back and bought 4 more matched quads. I expect to play my VC 50Hs for a long, long time.
Warning: the last two letters do matter. A regular 6P14P will not survive. Take a few minutes to familiarize yourself with the Soviet era tube designations and suffixes. You must use the "K", "EV" or "ER". Of the three, the EV seems to be the most musical. The "ER" is rated for 10,000 hours, but I have repeatedly heard that they sound too stiff in guitar amps.
Suggestion: buy the tubes from a vendor who you can trust. I have purchased all of mine from Jim McShane. He's never sold me a dud or steered me in the wrong direction, and he is meticulous in his testing of tubes.
These are beautiful sounding heads. I hope these suggestions help folks out as they strive to find that perfect tone.