Quote:
Originally Posted by Popester
Price of tv then was a bunch of money in ‘70 or ‘72. At least it was before the troubled SG613 gated switch design that most techs hated working on.
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I liked those models, it was the earlier ones that were the nightmares. We were one of only two shops in our city that would work on Sony TVs.
The thing with the Sonys was that you could NOT use anything but a Sony part for the SG613 horiz output, the 2SC867A regulator (God, I can't believe I still remember those numbers) and the damper diode (which I have forgotten, but it was huge and metal cased).
When the horiz output shorted, it always shorted the regulator which was a series/pass arrangement. If you put in just a new SG613 without changing the regulator, it would blow immediately because the regulator pumped full B+ into it.
These parts weren't cheap but if you changed all three at the same time using Sony parts, resoldered the horiz drive circuit, recapped the vertical circuit, you wouldn't see them back for at least three years. Lots of techs tried using HEPs, SKs, ECGs, etc. but it was a futile effort. Use Sony parts or *boom* and smoke would be the result.
John