Once again while I wait for some parts I decided to try another project that I’d been thinking about. This one was going to be a small tube stereo table top style build for someone that might want to use their pedal board, multi-effects pedal, or even an iPad or iPod for true stereo at a lower volume. So this is a stereo single-ended amp running with 3 1/2 watt output transformers as well as high & low inputs and a volume control for each channel. I used a 5Y3GT to power the circuits with a 6V6GT & 12AU7 on each side, and found it turned out exactly as I had hoped it would be. It can also handle 5V4G & GZ34 rectifiers as well as 5881 or 6L6GC power tubes and any of the 12A*7 pre-amp tubes. It can also run different preamp & power tubes on either side at the same time as well so there’s lot of options for the gain structure the sound pressure level.
In a 16x8x2 enclosure I could also scale this circuit up to be a stereo build with push-pull output transformers running pairs of power tubes if needed.
So here’s some pics of my prototype in a 12x8x2 chassis.