Tube DIY Asylum

RE: My 211 monos can take either tube

24.27.41.140

Triode_Kingdom

In Reply to: RE: My 211 monos can take either tube posted by DAK on January 13, 2025 at 09:45:18

It's not a secret, in fact I applaud anyone who duplicates this. The amplifier operates in class A/A2. It contains three separate DC power supplies, plus an ultrasonic heater supply. Bias is monitored and corrected for drift using an HV opamp circuit. Frequency response is very good without feedback, but I applied about 6dB to improve damping factor.

Follow Ups:

RE: My 211 monos can take either tube - DAK 13:14:17 01/13/25 (1)
Wow, thank you for posting the schematic. I hope it sounds as good as it looks! About how many watts do you get from the 211?
- RE: My 211 monos can take either tube - Triode_Kingdom 15:34:42 01/13/25 (0)
  Midband power is about 30W, but it's less at low frequencies due to limitations of the output transformer.
  
  Edits: 01/14/25

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