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BrandRCA
ClassSuper-Control R-F Amplifier Pentode
Base5-pin
Filament6.3 V @ 300 mA
Construction
Primary TypePentode
EnvelopeST-12
SectionsSingle
Filament / Heater
Heater NotesHeater-cathode type
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage90 V
Grid 1 Voltage-3 V
Audio Performance
Key Features
- Remote cut-off type
- Super-control characteristic
- Low cross-modulation
- Reduced modulation-distortion
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R-F Amplifier (Plate 90V) | 90 V | 960 | 375000 | 360 | 5.6 mA |
| R-F Amplifier (Plate 180V) | 180 V | 1000 | 750000 | 750 | 5.8 mA |
| R-F Amplifier (Plate 250V) | 250 V | 1050 | 1000000 | 1050 | 5.8 mA |
| Mixer | 250 V | — | — | — | — |
Application Notes
Suitable for R-F amplifier, I-F amplifier, and mixer service. Volume control accomplished by variation of negative grid bias (requires approx 45V range). Screen voltage may be obtained via a series resistor of approx 80,000 ohms.
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