Quote:
Originally Posted by Findm-Keepm
Be sure to let Sony know if you do find that mod - Sony never issued any kind of mod in the SG-613 or SG-608 sets. It's a robust design, made weak by bad solder, bad caps and lightning strikes that juice the sets.
I'll see if I have the original service manual still - most of these sets were a cap swap (4.7uF@160V and 250V - we kept them in stock...), a bad chroma chip CX1-something, or a bad solder connection in the sweep area (which led to the 608/613 failing), and the occasional open cathode in the CRT, 490BEBP22 in most of the 19"ers.
Even in the 90s, the SG-613 from Sony was about 7 or 8 bux, far cheaper than a 6LQ6 was for tube sets. Most problems occurred when folks went with just the SCS and didn't look further, like the damper diode (SID30-15, subbed by Sony to another number - I can look it up) or the bad solder. You could power one up, check for proper drive, and know if you had it fixed before installing the SG-613. I think I've posted the Sony Bulletin on how to properly check the SCS out of circuit..
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I thought I heard a passing mention of a SG-613 mod on here somewhere, but who knows. I read so much here it kind of runs together.
I got that series of Japanese TV service manuals and only left out the one for Sony, thinking I'd never take on another one, who'd 'a thunk it. I'll just have to be extra cautious with this one and try to lay my hands on extra SG-613s. They should turn up all the time considering how sets that use them ate them so often.
I assume these were known for purity issues as well. I forgot to mention the image is darker at the top left, just like on my decade-newer KV-1926R.