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

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12AT7 vacuum tube outline illustration

Tube-number record

12AT7

5 archive entries

12AT7 is a tube type in the TubeDatabase archive (class: Twin Triode). Recorded specifications: brand Brimar, construction Dual triode, base Glass, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 2.5 W. The archive holds 5 photographed examples of this type.

Equivalent and related tube numbers

Commonly cross-referenced designations for 12AT7. Compatibility is not guaranteed. Before substituting, verify socket and pinout, heater voltage and current, bias requirements, and maximum ratings against the relevant manufacturers’ datasheets.

  • 6201
  • CV4024
  • ECC81
BrandBrimar
ClassTwin Triode
BaseNoval (B9A)
Filament12.6 V @ 150 mA

Construction

Primary TypeDual triode
EnvelopeT6 1/2
Base Material

Datasheets

Datasheet: 12AT7.pdf

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

Filters

5 tubes found

Manufacturers

RFT1

Brands

Glass
SectionsTwo

Filament / Heater

Heater NotesCenter-tap enables use on 12.6V or 6.3V supplies.

Absolute Maximum Ratings

Plate Voltage300 V
Plate Dissipation2.5 W
Grid 1 Voltage-50 V
Cathode Current20 mA
H-C Voltage250 V

Audio Performance

Key Features
  • Indirectly heated
  • Separate triode units
  • Heater center tap
  • Low noise factor
  • High conversion gain

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier100 V400013500543.7 mA
Class A1 Amplifier180 V660094006211 mA
Class A1 Amplifier250 V5500100005510 mA

Application Notes

Designed for use as a frequency changer, oscillator, grounded grid amplifier, and frequency multiplier for ultra-short waves. Useful up to at least 450 Mc/s.
RCA
2
Marconi Espanola1
Trigon1
Tung-Sol1

Related tube numbers

ECC812
  • Trigon 12AT7 tube - RFT

    12AT7

    Maker
    RFT
    Brand
    Trigon
  • RCA 12AT7, ECC81 tube — photo 1 of 2
    RCA 12AT7, ECC81 tube — photo 2 of 2

    Use the Left and Right Arrow keys to browse photos. Use Home for the first photo and End for the last photo.

    Photo 1 of 2

    12AT7, ECC81

    Brand
    RCA
  • RCA 12AT7 tube — photo 1 of 2
    RCA 12AT7 tube — photo 2 of 2

    Use the Left and Right Arrow keys to browse photos. Use Home for the first photo and End for the last photo.

    Photo 1 of 2

    12AT7

    Brand
    RCA
  • Marconi Espanola ECC81, 12AT7 tube — photo 1 of 4
    Marconi Espanola ECC81, 12AT7 tube — photo 2 of 4
    Marconi Espanola ECC81, 12AT7 tube — photo 3 of 4
    Marconi Espanola ECC81, 12AT7 tube — photo 4 of 4

    Use the Left and Right Arrow keys to browse photos. Use Home for the first photo and End for the last photo.

    Photo 1 of 4

    ECC81, 12AT7

    Brand
    Marconi Espanola
  • Tung-Sol 12AT7 tube — photo 1 of 6
    Tung-Sol 12AT7 tube — photo 2 of 6
    Tung-Sol 12AT7 tube — photo 3 of 6
    Tung-Sol 12AT7 tube — photo 4 of 6
    Tung-Sol 12AT7 tube — photo 5 of 6
    Tung-Sol 12AT7 tube — photo 6 of 6

    Use the Left and Right Arrow keys to browse photos. Use Home for the first photo and End for the last photo.

    Photo 1 of 6

    12AT7

Showing 1–5 of 5 results
Brand
Tung-Sol