My 1967 C210G had the audio amp circuit breaker pop today.  Apparently this circuit was an option according to the owners manual.  I can receive but cannot transmit on the radios.  Even with the battery disconnected it won't reset.  I assume it is the breaker itself that is defective.  Does anyone know the proper amperage  for the breaker?  This is a 12 v system. Where would I find a replacement breaker?