Tube-number record
4328-A
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BrandStandard Valves
ClassPentode
Base6-pin
Filament7.5 V @ 425 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesConstant current type
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage180 V
Cathode Current10 mA
H-C Voltage150 V
Audio Performance
Key Features
- Indirectly heated oxide coated
- Constant current type
- Control grid connected to top cap type B
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 250 V | 1900 | — | — | — |
Application Notes
The cathode should preferably be connected to the heater. If voltage must be applied between cathode and heater it should not exceed 150 volts. Protection should be provided for the heaters at the moment of switching on in series strings.
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