GMI-90
Tetrode · IHT · Special 6-pin · 1960
“Massive pulse modulator. Not for audio.”
Beam power tetrode rated at 140W for high-power output stages
GAIN0%
POWER100%
DRIVE50%
LINEARITY75%
EXECUTIVE SUMMARY
The GMI-90 is a indirectly-heated beam tetrode from Svetlana, introduced around 1960. Commonly used in pulse modulator applications. Massive pulse modulator. Not for audio.
APPLICATIONS
High-power output
Generic tetrode pulse modulator stage
• PA/public address
HISTORY
Introduced1960ManufacturerSvetlanaEquivalentsNone
Late ProductionSPECIFICATIONS
Heater Voltage25V
Heater Current7.15A
Max Plate Voltage33000V
Max Power140W
Sensitivity—
Gain Factor—
Internal Impedance—
PinoutSpecial 6-pin
Era1960
RarityRare
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.