25B8GT
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BrandKen-Rad
ClassDuplex Pentode-Triode
BaseOctal
Filament25V @ 150mA
Construction
Primary TypePentode-Triode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesVoltage between heater and cathode should be kept at a minimum if direct connection is not possible
Absolute Maximum Ratings
Audio Performance
Key Features
- Cathode type duplex tube
- Glass envelope
- Octal base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 100V | 2000 | 185000 | 370 | 7.6mA |
| Triode Section | 100V | 1500 | 75000 | 112.5 | 0.6mA |
Application Notes
The Ken-Rad 25B8GT is a cathode type duplex tube consisting of a pentode unit and a triode unit within a single envelope.
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