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Re: [Amps] SCR to adjust 240v to 200v

Subject: Re: [Amps] SCR to adjust 240v to 200v
From: Jim Brown <>
Date: Mon, 15 Aug 2016 09:30:25 -0700
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No surprise. About 40 years ago, I had a job maintaining and troubleshooting a wide range of installed systems -- audio, video, security, etc. One was a simple intercom in an apartment complex that used SCRs for something -- don't even remember what -- but they had a very low voltage rating, and were always failing from voltage induced on system wiring. Ten Tec made a similar error with too-low voltage ratings on the discrete semiconductors used in the keying logic of their otherwise very nice Titan 425 amp. In both cases, there were higher voltage rated parts in the same series, but I've got a feeling that, as so often happens, the bean counters subbed the lower voltage parts to save pennies.

73, Jim K9YC

On Mon,8/15/2016 9:12 AM, Michael Clarson wrote:
Lightning was always taking out some of the semiconductors. I'm going to try to find a manual and see exactly how they did it. -

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