ECC82 / 12AU7 audiotube

 45,00 99,00
The ECC82 high impedance amplifier triode was designed specifically for audio use and has a high amplification factor of 100. Mullard describes the ECC82 as a high μ double triode, having separate cathodes, primarily intended for use as a resistance-coupled amplifier or phase inverter.
This valve is still found in today’s designs of hi-fi audio amplifiers. In the classic Mullard designs of the 1950s and 1960s, the valve’s two halves were used as second-stage amplification and cathode coupled phase splitter.
The phase splitter was required so that the push-pull output stage was driven correctly.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 48 mm tall.
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This exhibit is the Mullard ECC82. Designed as audio and general-purpose triodes, two independent valves exist in the envelope. Each half is sensibly equivalent to one EC90 triode.
An amplification factor of 17 is quoted, which is much lower than that for the pin-compatible ECC82 at 85.
In television receivers, the ECC82 was used as frame and line timebase multi-vibrators, AGC circuits, and driver stages. It was as multi-vibrators that faults would most often develop.
ECC82/12AU7

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