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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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3-500ZG vacuum tube outline illustration

Tube-number record

3-500ZG

0 archive entries

3-500ZG is a tube type in the TubeDatabase archive (class: Power Triode). Recorded specifications: brand RF Parts, construction Triode, socket 5-pin, maximum plate voltage 4000 V, and maximum plate dissipation 500 W. The archive does not yet hold a photographed example of this type.

BrandRF Parts
ClassPower Triode
Base5-pin

Construction

Primary TypeTriode
EnvelopeGlass
Sections1

Filament / Heater

MaterialThoriated-tungsten

Absolute Maximum Ratings

Plate Voltage4000 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class AB2 Cathode Driven (CW)3000 V—4200—400 mA
Class AB2 Cathode Driven (CW)3500 V—5000—400 mA
Class C Telegraphy Grid Driven3500 V—5700—

Application Notes

The filament voltage, as measured at the socket, should be maintained within the range of 4.75 to 5.25 volts. Inrush current should be limited to two times normal current during turn-on. Forced-air cooling is required to maintain the base seals below 200°C.

Filters

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Manufacturers

Brands

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    Plate Dissipation
    500 W
    Grid 1 Voltage-200 V
    Cathode Current400 mA

    Audio Performance

    Key Features
    • Zero-bias operation
    • High-mu triode
    • Forced-air cooling required
    • Thoriated-tungsten filament
    300 mA
    Switching Modulator9000 V———180 mA