Tube-number record
85
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BrandRCA
ClassDuplex-Diode Triode
Base6-pin
Filament6.3 V @ 0.3 mA
Construction
Primary TypeMulti-section
EnvelopeST-12
Base MaterialSmall 6-Pin
Sections3 (2 diodes, 1 triode)
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Power Output0.35 W
Key Features
- Heater type
- Combined detector, amplifier, and automatic-volume-control
- Common cathode sleeve
- Independent tube units
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 135 V | 750 | 11000 | 8.3 | 3.7 mA |
| Class A Amplifier | 180 V | 975 | 8500 | 8.3 | 6 mA |
| Class A Amplifier | 250 V | 1100 | 7500 | 8.3 | 8 mA |
Application Notes
The 85 is recommended for performing the simultaneous functions of automatic volume-control, detection, and amplification. The triode unit may be used as a d-c amplifier to supply regulating voltage for a.v.c.
Datasheets
Datasheet: 85.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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