There was a recent post concerning the subject amplifier that seemed to imply that it was not suitable for operation on 24 Volts, if I understood the post correctly. This is not the case. These are designed to work with any of the older man packs, 12, 18 or 24 Volts, and work by plugging in to one of the audio sockets on these sets. The PTT line mutes the amp. But I am not going to hazard a guess as to the value of one :^)
Dan
ac6ao / g3ncr