Ampera
GU81
Pentode · IHT · Special · 1960
“Monster Russian transmitter.”
Power pentode delivering up to 450W in pentode, UL, or triode mode
Datasheet ↗SPICE
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN0%
POWER100%
DRIVE50%
LINEARITY75%
EXECUTIVE SUMMARY
The GU81 is a indirectly-heated pentode from Russian, introduced around 1960. Commonly used in transmitting applications. Monster Russian transmitter.
APPLICATIONS
Power output
Generic pentode transmitting stage
• PA/public address
HISTORY
Introduced1960ManufacturerRussianEquivalentsNone
Late ProductionSPECIFICATIONS
Heater Voltage6.3V
Heater Current8A
Max Plate Voltage2500V
Max Power450W
Sensitivity15 mA/V
Gain Factor—
Internal Impedance—
PinoutSpecial
Era1960
RarityModerate
Input Capacitance20pF
Miller Capacitance0.3pF
Output Capacitance10pF