That is a good sounding tube in a SET amplifier. I have not heard a 45 SET that I did not like. But, I have only heard about a half dozen 45 SET amplifiers over the years.

I hope you plan on running some efficient speakers, since it has about 1.5 watts of output power. That power level is more suited to 100db+ horns.

Please let us know what circuit you come up with? And please share your outcome?

Have fun!

Norris Wilson