• 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.

~2 watt SET decision

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
The 6EM7 is a tube that I can happily recommend as great sounding. I built an amp with virtually the same circuit as Gary Kaufman's, though the operating points were completely different. I used two NiMH batteries to bias the input stage, a 47k load resistor, 6k under the cathode of the output stage and 450V B+. Same 5k load.

I can say that it was a beautiful sounding amplifier, surprisingly good, really. But power at the speaker terminals was only about 0.5W; I found myself missing the 3+ watts of 2A3 muscle on 95dB speakers. :)

-- Dave
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.