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

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12AX7 vacuum tube outline illustration

Tube-number record

12AX7

164 archive entries

12AX7 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 1 W. The archive holds 164 photographed examples of this type.

Equivalent and related tube numbers

Commonly cross-referenced designations for 12AX7. Compatibility is not guaranteed. Before substituting, verify socket and pinout, heater voltage and current, bias requirements, and maximum ratings against the relevant manufacturers’ datasheets.

  • 7025
  • B339
  • CV4004
  • CV492
  • ECC83
  • M8137
BrandBrimar
ClassTwin Triode
BaseNoval (B9A)
Filament12.6 V @ 150 mA

Construction

Primary TypeDual triode
EnvelopeT6-1/2
Base Material

Datasheets

Datasheet: 12AX7.pdf

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

Filters

164 tubes found

Manufacturers

Mullard16Amperex4
Glass
Sections2

Filament / Heater

Heater NotesSeries or Parallel connection via heater centre tap (Pin 9)

Absolute Maximum Ratings

Plate Voltage300 V
Plate Dissipation1 W
Grid 1 Voltage-50 V
Cathode Current8 mA
H-C Voltage250 V

Audio Performance

Key Features
  • Indirectly heated
  • Separate triode structures
  • Common heater connections with center tap
  • Suitable for AC or AC/DC equipment

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier (Condition 1)100 V1250800001000.5 mA
Class A1 Amplifier (Condition 2)250 V1600625001001.2 mA

Application Notes

The valve is very suitable for use as a resistance coupled amplifier, paraphase amplifier, and cascade amplifier. Separate bias resistors are essential in cascade to avoid instability.
Philips
4
Telefunken4
Ei3
RCA3
RFT3
Sylvania3
Brimar2
Marconi Italiana2
Matsushita2
Bel1
Cifte1
General Electric1
R/T La Radiotechnique1
Raytheon1
Siemens1
Toshiba1
Tung-Sol1
Valvo1
Westinghouse1

Brands

Amperex13Mullard8RCA7Ge5Marconi4Miniwatt4Philips4Voice Of Music4Brimar3Fivre3Itt3Marconi Italiana3Mazda3Rad Tel3Raytheon3Rogers3Sylvania3The Fisher3CEI2Cifte2Daystrom2Ei2Geloso2Hammond2Leeds & Northrup2Motorola2National2NU2Sonotone2Tung-Sol2Ultron2Westinghouse2Zenith2Adzam1Altec1ATES1B&K1B&L1Bell & Howell1Cbs1Channel Master1Clairtone1Conn1Cornell1Curtis Mathes1Dario1Delta1Dumont1Dynaco1Dynacordr1El-Menco1Electrohome1Gammatron1Gap / R Computo1General Electric1Gt1H. H. Scott1Haltron1Heat1Heintz & Kaufman1Hitachi1Hoffman1Hoges1Ken-Rad1Kentron1Kinsman1La Radiotechnique R/T1Lindal1Magnavox1Marconi Radiotron1Master Series1Matsushita1Mil1Olson1Olympic1Osram1Peavey1Philco1Realistic1Selectron1Setchell Carlson1Shield1Siemens1Siemens-Röhre1Silvertone1Stromberg Carlson1Telectro1Telefunken1Teonex1Thomas1Toshiba1Trigon1Tungsram1United National1Valvo1Webcor1Zaerix1

Related tube numbers

ECC8368I638MC1670254B3393CV4923I613MC23MC53F912I65266811F921GT70251I661JTL-12AX71MC01
  • Leeds & Northrup 12AX7 tube - Amperex — photo 1 of 2
    Leeds & Northrup 12AX7 tube - Amperex — photo 2 of 2

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    Photo 1 of 2

    12AX7

    Maker
    Amperex
    Brand
    Leeds & Northrup
  • Voice Of Music 12AX7, ECC83 tube - Amperex

    12AX7, ECC83

    Maker
    Amperex
    Brand
    Voice Of Music
  • Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 1 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 2 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 3 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 4 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 5 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 6 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 7 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 8 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 9 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 10 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 11 of 12
    Voice Of Music ECC83, 12AX7, MC5 tube - Amperex — photo 12 of 12

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  • B&K 12AX7, ECC83 tube - Amperex — photo 1 of 4
    B&K 12AX7, ECC83 tube - Amperex — photo 2 of 4
    B&K 12AX7, ECC83 tube - Amperex — photo 3 of 4
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    12AX7, ECC83

    Maker
    Amperex
  • Trigon 12AX7, ECC83, I65 tube - Bel — photo 1 of 3
    Trigon 12AX7, ECC83, I65 tube - Bel — photo 2 of 3
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    12AX7, ECC83, I65

    Maker
    Bel
    Brand
    Trigon
  • Itt 12AX7 tube - Brimar — photo 1 of 2
    Itt 12AX7 tube - Brimar — photo 2 of 2

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    12AX7

    Maker
    Brimar
    Brand
    Itt
  • CEI ECC83, 12AX7 tube - Brimar — photo 1 of 4
    CEI ECC83, 12AX7 tube - Brimar — photo 2 of 4
    CEI ECC83, 12AX7 tube - Brimar — photo 3 of 4
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    ECC83, 12AX7

    Maker
    Brimar
  • Mazda, Cifte 12AX7 tube - Cifte — photo 1 of 2
    Mazda, Cifte 12AX7 tube - Cifte — photo 2 of 2

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    12AX7

    Maker
    Cifte
    Brand
    Mazda, Cifte
  • United National 12AX7, ECC83 tube - Ei — photo 1 of 3
    United National 12AX7, ECC83 tube - Ei — photo 2 of 3
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    12AX7, ECC83

    Maker
    Ei
    Brand
    United National
  • Gt GT7025, 7025, 12AX7, ECC83 tube - Ei — photo 1 of 3
    Gt GT7025, 7025, 12AX7, ECC83 tube - Ei — photo 2 of 3
    Gt GT7025, 7025, 12AX7, ECC83 tube - Ei — photo 3 of 3

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    GT7025, 7025, 12AX7, ECC83

    Maker
    Ei
    Brand
    Gt
  • Philips ECC83, 12AX7 tube - Ei — photo 1 of 4
    Philips ECC83, 12AX7 tube - Ei — photo 2 of 4
    Philips ECC83, 12AX7 tube - Ei — photo 3 of 4
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    ECC83, 12AX7

    Maker
    Ei
  • Kinsman 12AX7 tube - General Electric

    12AX7

    Maker
    General Electric
    Brand
    Kinsman
  • RCA ECC83, 12AX7 tube - Marconi Italiana — photo 1 of 2
    RCA ECC83, 12AX7 tube - Marconi Italiana — photo 2 of 2

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    ECC83, 12AX7

    Maker
    Marconi Italiana
    Brand
    RCA
  • Geloso 12AX7, ECC83 tube - Marconi Italiana — photo 1 of 4
    Geloso 12AX7, ECC83 tube - Marconi Italiana — photo 2 of 4
    Geloso 12AX7, ECC83 tube - Marconi Italiana — photo 3 of 4
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    12AX7, ECC83

    Maker
    Marconi Italiana
  • National 12AX7 tube - Matsushita — photo 1 of 5
    National 12AX7 tube - Matsushita — photo 2 of 5
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    12AX7

    Maker
  • National 12AX7 tube - Matsushita

    12AX7

    Maker
    Matsushita
    Brand
    National
  • Voice Of Music ECC83, 12AX7, F91 tube - Mullard — photo 1 of 6
    Voice Of Music ECC83, 12AX7, F91 tube - Mullard — photo 2 of 6
    Voice Of Music ECC83, 12AX7, F91 tube - Mullard — photo 3 of 6
    Voice Of Music ECC83, 12AX7, F91 tube - Mullard — photo 4 of 6
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    ECC83, 12AX7, F91

  • The Fisher ECC83, 12AX7, I63 tube - Mullard

    ECC83, 12AX7, I63

    Maker
    Mullard
    Brand
    The Fisher
  • Telefunken ECC83, 12AX7, I63 tube - Mullard — photo 1 of 3
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    ECC83, 12AX7, I63

    Maker
    Mullard
    Brand
    Telefunken
  • 12AX7, CV492, MC1 tube - Mullard

    12AX7, CV492, MC1

    Maker
    Mullard
  • Webcor 12AX7 tube - Mullard

    12AX7

    Maker
    Mullard
    Brand
    Webcor
  • Dynaco ECC83, 12AX7, MC1 tube - Mullard — photo 1 of 3
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    ECC83, 12AX7, MC1

    Maker
    Mullard
    Brand
    Dynaco
  • Daystrom ECC83, 12AX7, I61 tube - Mullard — photo 1 of 3
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    ECC83, 12AX7, I61

    Maker
    Mullard
    Brand
    Daystrom
  • Heat ECC83, 12AX7, F91 tube - Mullard — photo 1 of 3
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    ECC83, 12AX7, F91

    Maker
    Mullard
    Brand
    Heat
Showing 1–24 of 164 results
12…7Next

ECC83, 12AX7, MC5

Maker
Amperex
Brand
Voice Of Music
Brand
B&K
Brand
CEI
Brand
Philips
Brand
Geloso
Matsushita
Brand
National
Maker
Mullard
Brand
Voice Of Music