7581A
Tetrode · IHT · Octal · 1960
“Ruggedized 6L6GC. Balanced, detailed.”
Beam power tetrode rated at 35W for high-power output stages
TRANSCONDUCTANCE0mA/V
GAIN0%
POWER88%
DRIVE50%
LINEARITY75%
EXECUTIVE SUMMARY
The 7581A is a indirectly-heated beam tetrode from Tung-Sol·GE, introduced around 1960. Commonly used in power (pp) applications. Ruggedized 6L6GC. Balanced, detailed.
APPLICATIONS
High-power output
Generic tetrode power (pp) stage
• PA/public address
HISTORY
Introduced1960ManufacturerTung-Sol·GEEquivalents6L6GC (ruggedized)
Late ProductionSPECIFICATIONS
Heater Voltage6.3V
Heater Current0.9A
Max Plate Voltage500V
Max Power35W
Sensitivity6 mA/V
Gain Factor—
Internal Impedance—
PinoutOctal
Era1960
RaritySought-after
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.