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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