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  2. 12AU7 - Wikipedia

    en.wikipedia.org/wiki/12AU7

    The 12AU7, on the other hand, is described as an "A.F. double triode". [3] Data sheets suggest an upper frequency limit of 30 kHz for the 12AU7/ECC82 and it is not described as a "special quality" device. [4] This contrasts with the 6AB4/EC92 and 12AT7/ECC81 which are both R.F. devices operating up to VHF.

  3. 12AX7 - Wikipedia

    en.wikipedia.org/wiki/12AX7

    12AX7 (also known as ECC83 [1]) is a miniature dual-triode vacuum tube with high voltage gain.Developed around 1946 by RCA engineers [2] in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947.

  4. 12AT7 - Wikipedia

    en.wikipedia.org/wiki/12AT7

    Unlike the situation with the 6C4 and 12AU7, both the 6AB4 and the 12AT7 are described by manufacturer's data sheets as R.F. (Radio Frequency) devices operating up to VHF frequencies. [ 1 ] The tube has a center-tapped filament so it can be used in either 6.3V 300mA or 12.6V 150mA heater circuits.

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  8. List of Mullard–Philips vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_Mullard–Philips...

    ECC82/12AU7 (6067, M8136, B329) – Medium-mu dual triode for use as AF amplifier, noval base, identical to XCC82 except for heater ratings. Two EC90/6C4s in one envelope; [ 6 ] however, the ECC82 is only specified as an audio frequency device.

  9. List of Air Ministry specifications - Wikipedia

    en.wikipedia.org/wiki/List_of_Air_Ministry...

    The second part was a number identifying it in sequence and then after the slash, the year it was formulated, so in the example given above, B.12/36 signifies a specification for a heavy bomber, the twelfth specification of all types issued in 1936. Specifications were not always issued in sequence. [1]