801A

Power Triode — DHT — UX4

RCA

Known Equivalents & Substitutes

801VT62CV62110Y202A

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)600V

Anode Dissipation (max)Anode Dissipation (max)20W

Cathode Current (max)Cathode Current (max)85mA

Max Grid ResistorMax Grid Resistor0.5MΩ

Typical Operating

Anode Voltage (typical)Anode Voltage (typical)425V

Grid 1 Bias VoltageGrid 1 Bias Voltage-40V

Anode CurrentAnode Current18mA

Anode ResistanceAnode Resistance5,000Ω

TransconductanceTransconductance

Output

Output PowerOutput Power1.6W

Load ImpedanceLoad Impedance10,200Ω

Capacitances

Grid-to-Plate CapacitanceGrid-to-Plate Capacitance6pF

Grid-to-Cathode CapacitanceGrid-to-Filament Capacitance4.5pF

Anode-to-Cathode CapacitanceFilament-to-Plate Capacitance1.5pF

Heater

Heater VoltageFilament Voltage7.5V

Heater CurrentFilament Current1.25A

Notes

Grid resistor must not exceed 0.5 MΩ with cathode bias or 0.1 MΩ with fixed bias.
Filament is thoriated tungsten and may be operated on AC or DC.
Originally designed for RF transmitter service; also widely used in audio SE amplifiers. The 801A is an uprated version of the earlier 801/10/10Y with improved plate dissipation (20W vs 12-16W).
Shares the same UX4 pinout as the 45, 2A3, and 300B directly-heated triodes.
Mounting position: vertical with base down, or horizontal with plane of plate vertical (on edge).

Pin Layout — UX4

1Filament +

2Plate

3Grid

4Filament -

Socket-Compatible Tubes ⚠ Not electrically compatible

References