Data: MediumMedium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
Companion 2V battery DHT with same filament voltage and UX4 base, but designed as power output tube with lower mu (~3.8) and higher current (12mA vs 3mA)
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Plate Voltage (max)180V
Typical Operating
Anode Voltage (typical)Plate Voltage (typical)180V
Grid 1 Bias VoltageGrid Bias-13.5V
Anode CurrentPlate Current3.1mA
Notes
DHT tube: the filament serves as the cathode; there is no heater-cathode isolation.
Designed for 2V dry-cell (battery) filament supply at 0.06A — extremely low filament power for portable sets.
TDSL lists operating data at Va=135V: Vg=-9V, Ia=3mA, ra=10300 Ohm, gm=0.9 mA/V. GE Essential Characteristics lists the same ra and gm at Va=180V with Vg=-13.5V, Ia=3.1mA.
Radiomuseum lists typical operation at Va=90V: Ia=2.5mA, Vg=-4.5V, gm=0.85 mA/V.
No Pa_max or Rg_max is specified on known datasheets.
Pin Layout — UX4
1Filament (f-)
2Plate (Anode)
3Grid
4Filament (f+)
Socket-Compatible Tubes ⚠ Not electrically compatible