Data set 01
2026 Electro Harmonix
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Cathode Current Maximum
100 mA
Power Output
8 W
Plate 303 V; ClassA;OneTube
Power - Triode ·Triode
300BEH
Electro-Harmonix directly heated 300B-family power triode for low-frequency Class A amplification. With roughly 40 W plate dissipation, published single-ended conditions provide several watts of audio output while retaining traditional low-mu 300B behavior.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 5 V / 1.25 A
Description
Directly heated power triode with coated filament for low-frequency power amplification.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 5 V
- Nominal heater current
- 1.25 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
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0045 S
- Amplification factor
- 3
- Max plate voltage
- 450 V
- Max plate dissipation
- 40 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.