Same UX4 base, similar power triode characteristics but higher current capability (60mA vs 36mA) and different mu (4.2 vs 3.5). Requires different bias.
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Plate Voltage (max)275V
Anode Dissipation (max)Plate Dissipation (max)10W
Cathode Current (max)Plate Current (max)36mA
Max Grid ResistorGrid Coupling Resistance (max)1MΩ
Typical Operating
Notes
Pa_max (10W) is not stated in any US manufacturer datasheet (RCA, Sylvania, Tung-Sol, Cunningham); sourced exclusively from the AWV Radiotron Australian datasheet (October 1941).
DHT tube: the filament serves as the cathode; there is no heater-cathode isolation.
Self-bias is recommended in all operating conditions; required when using the maximum 1 MΩ grid coupling resistor.
Pin Layout — UX4
1Filament (f-)
2Plate (Anode)
3Grid
4Filament (f+)
Socket-Compatible Tubes ⚠ Not electrically compatible