6AK5
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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, 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.