81
0 Tubes in archive
BrandRCA
ClassHalf-Wave Rectifier
BaseMedium 4-Pin Bayonet
Construction
Primary Typehigh-vacuum
Rectifier Typehalf-wave
EnvelopeS-19
Sectionssingle
Filament / Heater
Materialcoated
Absolute Maximum Ratings
Plate Voltage700 V
Cathode Current85 mA
Audio Performance
Key Features
- High-vacuum type
- Coated filament
- Full-wave rectification possible with two tubes
- Voltage-doubling system compatible
Application Notes
The base pins of the 81 fit the standard four-contact socket which should be mounted to hold the tube in a vertical position. Provision should be made for free circulation of air around the bulb since it becomes quite hot during operation. The filter may be of either the condenser-input or choke-input type. If an input condenser is used, peak value rating should be considered (approx 1.4x RMS).
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