[Boatanchors] Squeal

[Glen Zook]

Such is usually a sign of a bad electrolytic in the audio output stage.  Replace C-304 (20 mfd) with a 22 mfd capacitor.  That capacitor is from Pin-3 of V-14B (6GW8) to ground.
 Glen, K9STH 
Website: http://k9sth.net

      From: RAY FRIESS <rayfrijr at msn.com>
 To: boatanchors <boatanchors at mailman.qth.net>; "boatanchors at puck.nether.net" <boatanchors at puck.nether.net> 
 Sent: Friday, July 6, 2018 1:23 PM
 Subject: [Boatanchors] Squeal
   
Heath SB101.  When I turn audio gain up over one quarter of range, radio takes off into a loud squeal.  RF gain or mode settings make no difference.  Suggestions?  Bad PCB ground maybe?