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BrandSylvania
ClassPentode
BaseMiniature Button 7-Pin
Filament6.3V @ 300mA

Construction

Primary TypePentode
EnvelopeT-5 1/2
SectionsSingle

Filament / Heater

Heater NotesHelical wound heater

Absolute Maximum Ratings

Plate Voltage300 V
Plate Dissipation3 W
Grid 2 Voltage300 V
H-C Voltage200 V

Audio Performance

Key Features
  • Low hum
  • Non-microphonic operation
  • Helical wound heater
  • Rigid mounting

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Triode Connected250V4800-3612.2mA
Pentode Connected (100V G2)100V3900500000-5mA
Pentode Connected (125V G2)250V45001500000-7.6mA
Pentode Connected (150V G2)250V52001000000-10.6mA

Application Notes

The hum level at the plate averages 1.2 millivolts when used as a normal voltage amplifier with a stage gain of 340 and the 6.3 Vac heater supply balanced to ground.

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