AVA Vision Set 400 v Belles SA-100

I like to be able to change between them, the 6SN7 is more detailed, but the 300B can sound very nice with small assemble jazz.

It is useable, but could be interesting trying an amp better suited to the gain of Supratek. Accuphase has some class A power amps that one can change gain in 3 levels I think, but unfortunately they are out of my price range.

@gryphongryph 

So you can adjust the gain to a correct level with the 300B output?  For the fixed 6SN7 output have you thought about trying a pair of Rothwell attenuators or something similar.  They will let you take 10db off of the maxed out gain for the 6SN7 outputs. There are also other makers but I have used the Rothwell's and they work.  Their company specializes in MC phono preamps in the UK.

I use two Rothwell’s at my power amp inputs which helps a little bit, no the 300B is still too high, I asked Mick if the power amp would work with the Cabernet and he said no problem!!!

I didn’t think I would have this problem, so never looked for it, after doing some research it seams this is getting to be a common problem with high gain pre amps, as most power amps today can be driven with passive pre amps!

AFAIK, the Benchmark AHB2 has the most range of adjustable gain of any currently available power amp.

@gryphongryph 

If you cannot turn one of the outputs down to zero (back toggle flipped toward the rear) then your preamp is not functioning as it should and you need to contact Mick.  If the adjustment is on the 300B output and you are trying to use the full 26db gain output on the 6SN7  output with the Belles then even with the Rothwell's you are still getting 16db gain which is to much for that amp.  There are plenty of amps on the market that will work with your preamp/speaker combo but if the Cabernet Dual is not operating as advertised then you need to contact Mick or at least reach out to Johnny @jslateiv and see if he has any suggestions.