Data set 01
2026 Electro Harmonix
Published operating points and test conditions from this source.
SECTION 1
Beam Power
Other
Cathode Current Maximum
230 mA
Power Output
12 W
Plate 250 V; Screen 250 V
Power - Beam (NOT sweep) ·BeamPower
KT90EH
Modern KT90-family high-power beam tetrode intended for audio output amplification, providing greater dissipation and current capability for demanding hi-fi and musical-instrument power stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 6.3 V / 1.8 A
Description
Beam tetrode for low-frequency power amplification in HI-FI audio output stages.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 1.8 A
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Beam Power
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0108 S
- Max plate voltage
- 850 V
- Max screen voltage
- 600 V
- Max plate dissipation
- 46 W
- Max screen dissipation
- 8 W
Published ratings and characteristics promoted from the approved source.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.