Ampera
VT-91
Pentode · IHT · Octal · 1942
“Military 6J7.”
Small-signal pentode for low-noise voltage amplification
Datasheet ↗SPICE
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN0%
POWER2%
DRIVE50%
LINEARITY75%
EXECUTIVE SUMMARY
The VT-91 is a indirectly-heated pentode from RCA, introduced around 1942. Commonly used in preamp applications. Military 6J7.
APPLICATIONS
Voltage amplifier
Generic pentode preamp stage
HISTORY
Introduced1942ManufacturerRCAEquivalents6J7 mil
Pre-WarSPECIFICATIONS
Heater Voltage6.3V
Heater Current0.3A
Max Plate Voltage300V
Max Power0.83W
Sensitivity1.22 mA/V
Gain Factor—
Internal Impedance—
PinoutOctal
Era1942
RarityModerate
Input Capacitance6pF
Miller Capacitance0.005pF
Output Capacitance7pF