Air Tight ATM-211 Mono Amplifier features:

  • Unprecedented high power 22W derived from broadcast-oriented 211 valve with direct-coupled cathode-follower stage
  • All-stage triode-driven non-NF Class-A operation to achieve pure, unimpaired sound
  • Independently coiled transformer for amp-stage, bias, heater and relay circuits to remove mutual interferences
  • DC-driven heater filament to eliminate hum of output valve
  • Relay-activated muting circuit for long life of electrolytic capacitor
  • Bias meter to check operation status of output valve
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