247-E

The General Radio 247-E Variable Air Capacitor was introduced in Bulletins 1923 and remained available through Bulletin 933 (1931).

The Type 247-E is a general-purpose, air-variable capacitor used in the construction of radio receivers and transmitters and experimental use. The 247-E is part of the 247 series of mounted variable capacitors. Unmounted versions were available as components at a reduced cost. Mounted versions were supplied with a dial, panel and drawn steel case. The 247-E is constructed of brass stator and rotor plates using soldered construction. The capacitor is operated by a slow-motion drive and counter-weighted die cast gear. The dial is calibrated in capacitance and 0 to 100 logging scale.

Specifications

• Capacitance: 500 pF
• Zero Capacitance: 20 pf
• Maximum Voltage: 500 V peak
• Calibration:Dial is calibrated directly in pF, accurate to 3% of full-scale reading

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