If the amplifier is for the AR3 speakers you mentioned in an earlier post I suggest that you refurbish the speakers first, before chasing after amplifiers.
The speaker crossover parts should be evaluated and replaced as needed and the woofer surrounds will most likely require re-doping in order to properly re-seal the speakers and bring them up to spec.
The speaker crossover parts should be evaluated and replaced as needed and the woofer surrounds will most likely require re-doping in order to properly re-seal the speakers and bring them up to spec.