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6AK5 vacuum tubes, from left to right: EF95 by Phillips, 6AK5 by NEC, 6Zh1P Russia (Novosibirsk), 6Zh1P Russia (Svetlana)

The 6AK5 vacuum tube is a miniature 7-pin sharp-cutoff pentode used as RF or IF amplifier especially in high-frequency wide-band applications at frequencies up to 400 MHz.

It is also known as EF95 under its Mullard-Phillips designation and was produced in the former Soviet Union as type 6Zh1P (Russian: 6Ж1П) under the Russian designation system.

A version of this tube with extended ratings was designated 6AK5W and 6Zh1P-EV (Russian: 6Ж1П-ЕВ) respectively.

Even though primarily intended for VHF amplification(1), the tube has found some use in audio applications as a microphone preamplifier, for instance in LOMO 19A9 microphone and in guitar effects stompboxes, such as Metasonix TM-7 Scrotum Smasher.

The 6AK5 was used in some types of radiosonde, (weather balloon payloads), in the 1960s and 70s. Because of the non-recoverable nature of the equipment, the single 6AK5 was soldered directly to the printed circuit board and served as the only active device in the circuit, performing the function of a low frequency modulation oscillator and the high frequency carrier oscillator and output stage.

See also[edit]

List of vacuum tubes

External links[edit]