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

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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Tube-number record

DF 23

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BrandPhilips Miniwatt
ClassVariable-mu pentode
BaseSide-contact (P-base)

Construction

Primary TypePentode
EnvelopeGlass
Sections1

Filament / Heater

MaterialTungsten

Absolute Maximum Ratings

Plate Voltage135 V
Plate Dissipation0.5 W
Grid 2 Voltage135 V
Grid 1 Voltage-0.5 V
Cathode Current2 mA

Audio Performance

Typical THD0.56%
Key Features
  • Variable-mu
  • Battery operation
  • Directly heated
  • Low current consumption

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Fixed screen-grid voltage90 V5802500000200.65 mA
Fixed screen-grid voltage120 V6502500000201 mA
L.F. Amplifier (Vb=120V)120 V——500.54 mA

Application Notes

Variable-mu pentode designed for H.F., I.F., and L.F. amplification in battery-powered or mains-connected receivers.

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