Thanks for that!! that is an extremely interesting article !!!
certainly some more ideas to work on now
from Ron...


Carbon resistors, dirty contacts inside switches and poor solder joints are
all suspect. On your S-77 and may be the others, you may have silver
migration on the capacitors inside the IF transformers. Robert Casey has a
very helpful article he

http://www.geocities.com/wa2ise/radios/repair.htm#if

Frank Dresser