Sounds like the 10y will introduce far too much gain which you will have to attenuate thus likely ruining the sound. I mentioned system gain structure earlier, and it is very important, more important than the amplification stages themselves.
The 10y is a bitch of a tube. You cannot wind a good output transformer for it...anyone that tells you they can either are deaf or have very low expectations of sound...so for a preamp we are limited to different output topologies including the mu follower which Ale uses. Trouble with the hybrid mu-follower is that unlike an OPT we end up with all the gain of the tube which in my situation is excellent but in yours not so much. Ale does recommend a resistor divider to attenutate some of the gain and perhaps that is an option should you still go with the 10, but it is still attenuation, and resistor attenuation at that which may or may not be better sounding than letting the Slagle Autoformers do all the attenuating work (I have the silver version with the Bent AVC-1 which Dave made for me and John Chapman supplied the control circuitry).
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