50

Power Triode — DHT — UX4

RCA

Known Equivalents & Substitutes

VT-50CV2533

Similar Tubes (Not Drop-In Compatible)

Later DHT power triode with similar Class A output role, UX4 base, higher output (3.5W SE vs 4.6W) at lower plate voltage (250V), and 2.5V/2.5A filament

45

UX4-base DHT power triode with similar low mu (3.5 vs 3.8) but lower plate voltage (275V vs 450V max) and lower power output (1.6W vs 4.6W)

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Plate Voltage (max)450V

Anode Dissipation (max)Plate Dissipation (max)25W

Typical Operating

Anode Voltage (typical)Plate Voltage (typical)450V

Grid 1 Bias VoltageGrid Bias-84V

Anode CurrentPlate Current55mA

Anode ResistancePlate Resistance1,800Ω

TransconductanceTransconductance

Output

Output PowerPower Output (Class A, single-ended)4.6W

Load ImpedanceLoad Resistance4,350Ω

Heater

Heater VoltageFilament Voltage7.5V

Heater CurrentFilament Current1.25A

Notes

DHT tube: the filament serves as the cathode; there is no heater-cathode isolation.
Pa_max = 25W per GE Essential Characteristics and radiomuseum.
GE Essential Characteristics: Va=450V, Vg=-84V, Ia=55mA, ra=1800 Ohm, gm=2.1 mA/V, mu=3.8.
Raytheon data confirms: Va=450V, Vg=-84V, Ia=55mA, Pout=4.6W, RL=4350 Ohm.
MIL-HDBK-213A lists this tube as VT-50.

Pin Layout — UX4

1Filament (f-)

2Plate (Anode)

3Grid

4Filament (f+)

Socket-Compatible Tubes ⚠ Not electrically compatible

12A 26 2A3 30 300B 31 40 45 71A 801A 841 842 845 UX112A UX199

References