[Kenwood] Kenwood TS 711 troubles

[DLe9480907 at aol.com]

Hello to all you Kenwood lovers. well my trusted 2mt rig is showing signs of 
its age. this TS-711 when first turn on has very distorted rec.audio all most 
like growling but  Transmit seems to be OK. after a bit of warm up time works 
like normal. this 711 is run off external 12 Ps so no heat being generated by 
the internal supply. anyone had this happen before or know of a common fix. 
Thanks Darryl WA5TOO