This is an amplifier I built with a couple of transformers from a Diytube ST35 that got parted out and sold. It uses a quartet of 6BQ5 in ultra-linear mode with no other global negative feedback. The amp made 35 watts into a 10 ohm resistor which was a surprise to me as I was expecting more like 20 watts. I delivered it to the customer in prototype form with the intention of making a nice front panel and puting it in a more professional looking box once he had approved the design. So far I have been unable to retrieve tha amp to do the finish work. He loves the particle board box and the somewhat ugly front panel. As a concession to my vanity he did let me stencil Hammertone LFA onto the box so poeple would know what they were looking at. I have seen him at a couple of gigs with it and believe me it gets some looks. I designed it to make clean power right to its maximum rating which it does and the owner loves the sound it gives his violin.
Here it is on the bench getting measured:
Don