[NJARC] philco console model 47-1230

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ok.....here is a good one and I am curious to see what the intelligencia 
thinks. I have been restoring a philco console that belonged to the 
grandfather of a close friend. I have changed every cap including the filter 
caps, reconed the speaker and aligned the AM FM and SW and I am getting lots 
of static type noise with am and fm reception that seems to get worse as I 
use the tone control......now here is the funny/odd part. When I plug the 
unit into my isolation variable transformer and crank it up to 131 volts it 
works superbly. At first I had thought that this was a classic case of 
silver mica migration but then stumbled upon the variac 130 volts. I am 
thinking that this might be caused and remedied by replacing with either a 
lower or higher value filter cap(s)....opinions please and thanks.