KT90
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ClassAudio Power Pentode
BaseOctal
Filament6.3V @ 1.6mA
Construction
Primary TypeBeam-power pentode
EnvelopeGlass
Base MaterialOctal, 8 pins
SectionsSingle
Filament / Heater
Heater Notes+/- 0.6 Volts AC or DC
Absolute Maximum Ratings
Plate Voltage750 V
Plate Dissipation50 W
Grid 2 Voltage650 V
Grid 1 Voltage-200 V
Cathode Current230 mA
H-C Voltage300 V
Audio Performance
Power Output160 W
Key Features
- Anode dissipation 50W
- 110W output per pair in push-pull at 550V
- 160W output per pair at 750V anode / 600V screen
- Recommended replacement for 6550, 6550A and KT88
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Connection 1 | 250V | 14000 | 11000 | - | 145mA |
| Pentode Connection 2 | 400V | 8800 | 25000 | - | 90mA |
| Triode Connection | 250V | 15000 | 650 | 9 | 153mA |
Application Notes
Primarily designed for use in audio frequency power amplifier applications.
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