75
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BrandRCA
ClassDuplex-Diode High-Mu Triode
BaseSmall 6-Pin
Filament6.3V @ 300mA
Construction
Primary TypeDuplex-Diode High-Mu Triode
EnvelopeST-12
SectionsTwo diodes and one high-mu triode
Filament / Heater
Heater NotesA. C. or D. C.
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Combined detector, amplifier, and automatic-volume-control
- Two diode plates around a common cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 250V | 1100 | 91000 | 100 | 0.8mA |
Application Notes
The 75 is recommended for use only in resistance-coupled circuits. Diode-biasing of the triode unit is not suitable because of the probability of triode plate-current cut-off.
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