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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.