813
Pentode · DHT · Special · 1938
“Beam tetrode giant. Deep controlled bass in triode.”
Power pentode delivering up to 125W in pentode, UL, or triode mode
GAIN FACTOR0
TRANSCONDUCTANCE0mA/V
GAIN8%
POWER100%
DRIVE50%
LINEARITY95%
EXECUTIVE SUMMARY
The 813 is a directly-heated pentode from RCA·Amperex, introduced around 1938. Commonly used in transmitting applications. Beam tetrode giant. Deep controlled bass in triode.
APPLICATIONS
Power output
Generic pentode transmitting stage
• PA/public address
HISTORY
Introduced1938ManufacturerRCA·AmperexEquivalentsVT-144
Pre-WarSPECIFICATIONS
Heater Voltage10V
Heater Current5A
Max Plate Voltage2250V
Max Power125W
Sensitivity2.8 mA/V
Gain Factor8
Internal Impedance—
PinoutSpecial
Era1938
RarityModerate
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.