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My 211 monos can take either tube

24.27.41.140

Triode_Kingdom

In Reply to: RE: why don't you use a 6SL7? posted by Story on January 13, 2025 at 02:11:15

Schematic:

Follow Ups:

RE: My 211 monos can take either tube - DAK 09:45:18 01/13/25 (3)
Does this 6sl7/aq7 stage feed into another amplification stage? Have you posted the complete schematic? If you want to keep your circuit confidential I totally understand.
- RE: My 211 monos can take either tube - Triode_Kingdom 12:31:18 01/13/25 (2)
  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.
  - 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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