WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
The 46 are regarded as a great driver tube. With the G2 connected to the plate, they operate Class A. I suspect the 46 would sound good as an output tube. I also guess the 45 might sound a little better, but at $50+ each for NOS, I would try that 46 tube.
wasn't there also a simple 47 SE in a recent audioXpress -- i went thru my tube collection and came up with a single example.... now if i could figure a use for all the 28 (or were they 26s -- time for bed ) i have.
Yes, absolutely worth a try. A couple of years ago I threw together a single channel (triode strapped) 46-based SE amp. Used a 6SL7 as a driver. I experimented with both classic grounded cathode and SRPP for the 6SL7 driver. Sounded a little different but I can't say definitely what I preferred. I also just used whatever junk PP output transformer was on the chassis I had (from Eric Barbour's idea for Single-Ended Glory for Under $100 GA 1997 Vol7 Num3). Ran the 46 at about 250 volts and 25ma.
I never built a "nice" version with two channels since I wanted to pursue a higher power design. But it definitely sounded nice even with one of my speakers which are something less than 90dB efficient. But definitely only enough power for a small room.