[Boatanchors] SB101 squeal
rayfrijr at msn.com
Sun Jul 8 11:07:11 EDT 2018
My thanks to all those who offered advice on the horrendous squeal when I turned the audio gain up over a quarter of the way.
It was, in fact, the bypass capacitor in the audio stage. Glen Zook identified the exact one for me too. This morning about 1 a.m. because I couldn't sleep, I opened up the 101 and replaced the capacitor. Fired up the rig and no more squeal. The next fix moves to the HP23 power supply. Even with the volume completely down, there is a noticable hum ... and we all know what that hum is characteristic of. HI HI. So, filter caps in the power supply are next.
But after replacing the bypass ... I was greeted by the rush of a radio with no antenna connected. I then crawled into bed and went to sleep. :)
It could be a little while before the filter replacement is accomplished. We have a parts store here in Salt Lake called Ra Elco. It is literally a heaven for those who need parts at a reasonable price. It started out as a ham store where us newbies would go to drool over the used gear and dream. Then it changed to a Lafayette outlet, before finally transforming into a parts store which would put even Radio Shack to shame. Anyhow, we turned on the news a couple weeks ago, and watched the report and video of the store up in flames, which started somehow overnight. About a third of the store was engulfed. The owners vow they will recover and get back in business ... but in the meantime, I'll have to scrounge through the shack to see if I can scrape together some filter caps and hope RaElco gets back in business soon. You could almost hear the groans of anguish from all the hams and repair shops in the state and a couple nearby states too...
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