I'm pretty sure that the 12AX7s are the phono stage tubes. It's been awhile since I owned the Minuet though.
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The Minuet in A uses the same as the Minuet--at least in mine (i have both of them). That is, 12AX7 in Phono (pair) and 6DJ8 in Line (pair).
BTW these are very forgiving preamps for tube selection; the cheapest Sovtek 6922s work really good in the line for example.
Enjoy you "A"--it's a sweet unit. Sure, others perform better, but for some reason, i find myself listening to more music with the 'A' in the system then i do with other, more expensive and "better" preamps. Cheers.
800uf 300v photoflash caps. They should be replaced ASAP. Some of the old photoflash caps in the old VTL and Melos preamps sound great and are safe to use because they are NOT used straight off of the rectifier (or near heat producing transformers). Unfortunately, the Minuet uses them crammed in between the transformer and the regulator heat sinks. Worst of all, they are used straight off the rectifiers. They are stacked on each other - creating a "single" 600 volt cap, so they can handle the power supply voltage just fine. But they see more ripple than a photoflash cap should see. They should be replaced. But be warned, this is not a fun preamp to work on. I replaced mine with Panansonic 470uf 400 volt caps. As used in this circuit, the pair creates a "single" 235uf 800v cap, which provides more than enough filtering and is MUCH more reliable. The biggest problem that you will face when replacing these caps is... (1) squeezing the caps in and (2) not damaging the circuit board traces.