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Original Message

RE: Hi B+ on Morrison Micro (moved from Tube DIY Asylum)

Posted by Paul Joppa on December 9, 2022 at 16:53:12:

I agree that a "low and hot" operating point is the key to understanding the Micro circuit. Running the 2A3 at 200v and 80mA (-30v bias) seems most likely; a paralleled 6SL7 in this circuit should have around 170 volts at the plate, so the voltages work out.

I calculate about 1.7 watts at clipping with a 3000-ohm load - not efficient, but very low distortion.