Tube-number record
1635
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1635 is a tube type in the TubeDatabase archive (class: High-Mu Twin Power Triode). Recorded specifications: brand RCA, year 1942, construction Dual triode, base Intermediate-Shell Octal 8-Pin, socket Octal, maximum plate voltage 400 V, and maximum plate dissipation 4.5 W. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassHigh-Mu Twin Power Triode
BaseOctal
Filament6.3 V @ 600 mA
Construction
Primary TypeDual triode
EnvelopeT-9
Base MaterialIntermediate-Shell Octal 8-Pin
Sections2
Filament / Heater
Heater Notesac or dc
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation4.5 W
Cathode Current90 mA
H-C Voltage90 V
Audio Performance
Typical THD5%
Power Output10.4 W
Key Features
- Coated Unipotential Cathode
- Class B Twin Amplifier
- Zero Bias
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B | 300 V | — | — | — | 54 mA |
| Class B (Variable Signal Only) | 400 V | — | — | — | 63 mA |
Application Notes
The driver stage should be capable of supplying the grids of the class B stage with the specified values at low distortion. In circuits where the cathode is not connected directly to the heater, the potential difference between heater and cathode should be kept as low as possible.
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