TubeDatabase
  • Tubes
  • Testers
  • Companies
  • Submit
  • About

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)
DisclaimerA–Z indexSubmit a tube
309A vacuum tube outline illustration

Tube-number record

309A

0 archive entries

309A is a tube type in the TubeDatabase archive (class: Voltage amplifier, variable-mu pentode). Recorded specifications: brand Western Electric, construction Pentode, base Small five-pin with silver-plated pins, socket Special / none, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.

BrandWestern Electric
ClassVoltage amplifier, variable-mu pentode
BaseSpecial / none
Filament10 V @ 320 mA

Construction

Primary TypePentode
EnvelopeST-12
Base MaterialSmall five-pin with silver-plated pins
SectionsSingle

Filament / Heater

Heater NotesDirect-current heater supply may be required for exceptionally low tube noise in audio-frequency applications.

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical Operation 1135 V10907000007604.75 mA
Typical Operation 2180 V1100100000011004.8 mA
Maximum Operating Conditions250 V1110130000014504.85 mA

Application Notes

Especially designed to minimize audio-frequency disturbances. Used in audio-frequency voltage amplifiers with volume control via grid bias adjustment and RF voltage amplifiers.

Datasheets

Datasheet: 309A.pdf

Download PDF
Loading datasheet...

Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

Filters

0 tubes found

Manufacturers

Brands

    0 results
    Plate Voltage250 V
    Grid 2 Voltage75 V
    H-C Voltage150 V

    Audio Performance

    Key Features
    • Variable-mu
    • Low noise
    • Internal suppressor-to-cathode connection
    • Silver-plated pins
    • Top cap control-grid terminal
    • Minimize microphonic noise
    Nominal Cut-off180 V5———