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
1221 vacuum tube outline illustration

Tube-number record

1221

0 archive entries

1221 is a tube type in the TubeDatabase archive (class: Pentode). Recorded specifications: brand Sylvania, construction Pentode, socket Special / none, maximum plate voltage 300 V, and maximum plate dissipation 0.75 W. The archive does not yet hold a photographed example of this type.

BrandSylvania
ClassPentode
BaseSpecial / none
Filament6.3 V @ 300 mA

Construction

Primary TypePentode
EnvelopeST-12C Long
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Plate Voltage300 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Amplifier250 V1225150000015002.1 mA

Application Notes

Specifically designed for amplifiers where non-microphonic tubes are required. Electrically identical to type 6C6.

Datasheets

Datasheet: 1221.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 Dissipation0.75 W
    Grid 2 Voltage100 V

    Audio Performance

    Key Features
    • Special non-microphonic construction
    • Fixed slope