TUBE 812A

GENERAL DESCRIPTION


photo 812A The 812A is a high perveance, easy to drive medium-mu triode closely modeled after the original RCA design. Improvements include a low loss easy to clean ceramic base and a cermic thermal insulator under the plate cap.
The 812A may be used as an AF power amplifier, modulator or RF amplifier at full ratings to 30 MHz and reduced ratings to 100 MHz.
picture 812A


TECHNICAL SPECIFICATIONS
ELECTRICAL
Filament Thoriated-tungsten
Voltage (AC or DC) 6.3 ±0.3 V
Current 4 A
Amplification factor (average) 29
Maximum frequency for full ratings 30 MHz
Interelectrode capacitances
Grid to filament
Plate to filament
Grid to plate

5.4 pF
0.77 pF
5.5 pF
MECHANICAL
Cooling Convection
Base Ceramic standard 4 pin
Socket SK4A
Plate connector PC1A or equivalent
Operating position Vertical or Horizontal (pins 1 & 4 in vertical plane)
Maximum dimensions
Diameter
Length

57 mm (2.23 in.)
166 mm (6.52 in.)
Net weight (average) 113 gm (4 oz)
Specifications may change without notice

THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS
Manufacturer Transmitter specifications Power in kW





THIS TUBE IS AVAILABLE FROM
Manufacturer Rebuilder Distributor
Penta Laboratories
Richardson Electronics





Vacuum Tubes, Inc.


PRICE LEVEL (US$)
1 2 3 4 5 6
0 - 10 10 - 100 100 - 1000 1000 - 10,000 10,000 - 50,000 50,000 - 100,000