[Boatanchors] Squeal

[Bry Carling]

6GW8 one of my favourites, more commonly known as ECL86!!

Great for transmitters and audio amplifiers!

Best regards - Brian Carling, AF4K


On Jul 6, 2018, at 4:57 PM, Glen Zook via Boatanchors <boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net>> wrote:

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<mailto:rayfrijr at msn.com>>
To: boatanchors <boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net>>; "boatanchors at puck.nether.net<mailto:boatanchors at puck.nether.net>" <boatanchors at puck.nether.net<mailto: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?



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