85
0 Tubes in archive
BrandRCA
ClassDuplex-Diode Triode
BaseSmall 6-Pin
Filament6.3V @ 0.3mA
Construction
Primary TypeDuplex-Diode Triode
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 | 135V | 750 | 11000 | 8.3 | 3.7mA |
| Class A Amplifier | 180V | 975 | 8500 | 8.3 | 6mA |
| Class A Amplifier | 250V | 1100 | 7500 | 8.3 | 8mA |
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.
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