Tube-number record
75
0 archive entries
75 is a tube type in the TubeDatabase archive (class: Duplex-Diode High-Mu Triode). Recorded specifications: brand RCA, construction Triode, socket 6-pin, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassDuplex-Diode High-Mu Triode
Base6-pin
Filament6.3 V @ 300 mA
Construction
Primary TypeTriode
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 | 250 V | 1100 | 91000 | 100 | 0.8 mA |
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.
Datasheets
Datasheet: 75.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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