Regarding the bypass cap-that is IF I leave out the feedback circuit...
Michael
Without it you will get a little degenerative feedback. It is your decision, try it both ways and see which way you like it better. Dont expect breathtaking audio from an
HQ-170, though. The IF bandwidth is far far too narrow for anything HI-FI. they are, however a good "battle conditions" receiver. (I have one) You may also want to disable Hammarlund's crappy "Auto Response" circuit. I have yet to find a good excuse for them.
But that is up to you. (if it has the feedback mod, it has prolly allready been done)