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Hey Bill, Based on the tube chart, the Fluid Drive gainstages are spread (cascaded)across several tubes. Since the first stage of fluid drive occurs on V2A, this is the most important stage of the fluid drive "channel". Each subsequent stage builds on the previous stage. As you add more...

Bill, You may find that is the ticket. Bob is cool and very helpful but remember he **only** sells JJ's. Mix it up among manufacturers. ;)

Hi Bill, Forgot to mention . . . You can get some nice reviews of different types of tubes from the Watford Valves website. Plenty of good info to start. Also, Mike at KCA Amplification is a great reference and has a really good selection of NOS and current manf tubes. NOS preamp tubes...

Bill, Don't know if this will help but the first thing I did was yank out the Mesa pre tubes on mine. Mine had 12ax7 R2 which are Sovtek LPS. I replaced with RFTECC83 and 12ax7 Silver Special (original 80's Chinese). The RFT's work great and you may prefer a darker tube in those positions...