Sony Trinitron KV-1921

[Jon A.]

Originally Posted by Findm-Keepm

or, recap, and replace the SG613 with an original, and replace the damper diode with the Sony suggested replacement for reliability. We did this in the 80s to Sonys we serviced, and had only one callback - for an unrelated CRT issue.

I may as well. At least my SG-613 is still good. Where is the damper diode and what is the sub?

[Findm-Keepm]

Originally Posted by Jon A.

I may as well. At least my SG-613 is still good. Where is the damper diode and what is the sub?

The damper hangs off the SG-613, usually on a terminal board, along with two caps - typcially a 330pf and a .014uf to .018uf Blue Epoxy Dipped cap. The blue cap tunes the horizontal to the flyback/deflection circuit, kind of analogous to the safety caps in US made sets. They are obsolete - but a good 715P or 716P (polypropylene film/foil) Orange Drop will also do.

Damper diode part number is SID30-15 on your set - Sony recommends replacement GH3F, Sony Part number 8-719-305-15, also the newer RS3FS diode, Sony Part number 8-719-312-71. ECG/NTE 506's WON"T work. Save your money.

If your SG-613 is good, then I'd recommend finding and replacing all Electrolytics in the Pwr supply and Horizontal - typically on the "VH" board. The 4.7uF 160V and 250V caps cause the most grief.

SG-613 Testing:http://www.talonix.com/images/TestingSG613.pdf