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46 — Power Triode, UX5 | Tubeofile | Tubeofile
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46
Power Triode — DHT — UX5 — RCA
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Data: Low
Low quality — significant gaps in core data (missing base, heater, universal parameters, or pins). Treat as a research stub; always cross-reference with datasheets.
↗ r-type.org
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
VT-63
CV2531
Similar Tubes (Not Drop-In Compatible)
2A3
Directly heated power triode on UX4 base, same 2.5V filament — higher power (3.5W SE) and lower ra
45
Directly heated power triode on UX4 base, same 2.5V filament — similar Class A power (1.6W) but true triode with no second grid
47
Directly heated power pentode on UX5 base, same 2.5V filament — pentode rather than dual-grid design
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Max Plate Voltage (triode)
300
V
Anode Dissipation (max)
Max Plate Dissipation (tetrode-connected)
10
W
Typical Operating
Anode Voltage (typical)
Plate Voltage
250
V
Grid 1 Bias Voltage
Grid Voltage
-33
V
Notes
MIL-HDBK-213A lists as VT-63 with service classification 'Class B amplifier'.
The 46 has two grids; for Class A triode operation both grids are tied together to form a single control element.
Class B push-pull operation with grids tied yields up to 20W output at 400V (per pair).
TDSL lists CV2531 as a close or identical substitute.
Radiomuseum classifies as 'Double Grid Power Amplifier' (ID 2835).
Commonly found in 1930s radio receivers and early audio amplifiers.
Pin Layout — UX5
1
2
3
4
5
1
Grid 1 (Control Grid)
2
Plate
3
Grid 2
4
Filament (f+)
5
References
https://frank.pocnet.net/sheets/127/4/46.pdf
Anode Current
Plate Current
22
mA
Anode Resistance
Plate Resistance
2,380
Ω
Transconductance
Transconductance
2.35
mA/V
Amplification Factor (μ)
Amplification Factor
5.6
—
Output
Output Power
Power Output
1.25
W
Load Impedance
Load Impedance
6,400
Ω
Typical Operating
Anode Voltage (typical)
Plate Voltage
300
V
Grid 1 Bias Voltage
Grid Voltage
0
V
Anode Current
Plate Current (no signal)
8
mA
Output
Output Power
Power Output (per pair)
16
W
Load Impedance
Load Impedance (plate-to-plate)
5,200
Ω
Absolute Maximum
Anode Voltage (max)
Max Plate Voltage (tetrode-connected)
400
V
Typical Operating
Anode Voltage (typical)
Plate Voltage
400
V
Grid 1 Bias Voltage
Grid Voltage
0
V
Anode Current
Plate Current (no signal)
12
mA
Output
Output Power
Power Output (per pair)
20
W
Load Impedance
Load Impedance (plate-to-plate)
5,800
Ω
Heater
Heater Voltage
Filament Voltage
2.5
V
Heater Current
Filament Current
1.75
A
Filament (f-)