Ampera
KT99
Tetrode · IHT · Octal · 1985
“Premium KT88 derivative. Nice tone, fragile.”
Beam power tetrode rated at 42W for high-power output stages
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN0%
POWER100%
DRIVE50%
LINEARITY75%
EXECUTIVE SUMMARY
The KT99 is a indirectly-heated beam tetrode from Ei·Chinese, introduced around 1985. Commonly used in power (pp) applications. Premium KT88 derivative. Nice tone, fragile.
APPLICATIONS
High-power output
Generic tetrode power (pp) stage
• PA/public address
VS KT88
Pd +20%Full comparison →
HISTORY
Introduced1985ManufacturerEi·ChineseEquivalentsKT88, 6550
ModernSPECIFICATIONS
Heater Voltage6.3V
Heater Current1.65A
Max Plate Voltage700V
Max Power42W
Sensitivity11 mA/V
Gain Factor—
Internal Impedance—
PinoutOctal
Era1985
RarityRare
Input Capacitance15pF
Miller Capacitance1pF
Output Capacitance8.5pF
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.