1206-B

The General Radio 1206-B Unit Amplifier was introduced in Catalog N (1954) and remained available through Catalog S (1965).

The Type 1206-B is a unit-style general-purpose amplifier for frequencies up to 500 kHz. The recommended power supplies are the Types 1201-A, 1203-B and 1204-B (adjusted to 300 V).

The 1206-B can deliver 3 watts of output power with reduced frequency response, and 1.5 watts with excellent audio response. With low hum and high gain, it is well suited for audio and ultrasonic laboratory use.

The circuit is a transformerless push-pull amplifier with a pair of 6W6-GT tubes in the output, driven by a 12AX7 whose two systems are used as a 1st gain stage and a phase splitter stage, respectively.

Specifications

• Frequency Response: 2 Hz to 500 kHz at 10 V (or less) output, down ≤3 dB
• Load Impedance: 600 Ω optimum
• Input Impedance: 100 kΩ in parallel with 35 pF
• Power Output: 10 Hz to 50 kHz, 3 W; 5 Hz to 100 kHz, 1.5 W; 250 kHz, 0.5 W

Links

• Experimenter November 1953 describing Type 1206-B
• GR 1206-B @ PA4TIM Fred's pages

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