{Collins} 75a-1

hello collins aficionados, need some help restoring a collins 75a-1serial #442. previous owners over the years have done some strange thing to the radio, #1 rf gain control no longer respond in the avc mode, works fine in am and cw mode. #2 no ground connection on the stand by relay on the rear of the chassis. #3 the 330 ohm cathode resister r 51 has been grounded bypassing the off fil on b+on switch. radio works fairly well on all bands. i notice some distortion on strong signals. receives ssb and cw ok.  of the many mysteries why would someone disable the rf gain in the avc  mode. your thoughts. mickey wa6fiz 

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