Power - Triode ·Triode
PA20
Directly heated Mazda mains-output triode for audio power amplification. Its low amplification factor, moderate plate resistance, and 15 W dissipation suit transformer-coupled Class A output stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 2 V / 2 A
Description
Directly heated mains output triode.
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
- 2 V
- Nominal heater current
- 2 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
- Plate resistance
- 1000 Ω
- Transconductance
- 0.0065 S
- Amplification factor
- 6.5
- Max plate voltage
- 300 V
- Max plate dissipation
- 15 W
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.