I have a Yamamoto A09 which is a 300b design,I have also owned the A08 and the A08s at the same time both were sold though recently.The build quality and sound is outstanding on all the Yamamoto amps but they are very hard to come by.
With that said I would look for one of the Dennis had amps,if you have the right speakers.
With that said I would look for one of the Dennis had amps,if you have the right speakers.