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Tube Database (7,341 tube types · 1,270 archive entries)

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Tube-number record

39/44

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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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
R-F Amplifier (Plate 90V)90 V9603750003605.6 mA
R-F Amplifier (Plate 180V)180 V10007500007505.8 mA
R-F Amplifier (Plate 250V)250 V1050100000010505.8 mA
Mixer250 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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