UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Sony SL-C7 Rebuild: Alive for 20 Seconds Then ‘POP” & Smoke

murphyv310 · 16th Jan 2021, 4:37 pm

Hi.
As a former engineer with (SES) Sony UK group of service depots I totally agree with Glyn. Basically on no account use non genuine transistors in the power supply. Non genuine transistors will last half an hour at the most. Replacing the electrolytic caps that have been mentioned with top quality 105c or 135c types (Panasonic or Vishay) will give a long lasting repair. Ensure all resistors in the primary circuit are not showing any signs of distress and not off value.
IMHO Some Sony power supplies are very fussy and can be a pain, the KV27PSI comes to mind as well.

16th Jan 2021, 4:37 pm	#6
murphyv310 Dekatron Join Date: Sep 2006 Location: Kilmarnock, Ayrshire, UK. Posts: 5,422	Re: Sony SL-C7 Rebuild: Alive for 20 Seconds Then ‘POP” & Smoke Hi. As a former engineer with (SES) Sony UK group of service depots I totally agree with Glyn. Basically on no account use non genuine transistors in the power supply. Non genuine transistors will last half an hour at the most. Replacing the electrolytic caps that have been mentioned with top quality 105c or 135c types (Panasonic or Vishay) will give a long lasting repair. Ensure all resistors in the primary circuit are not showing any signs of distress and not off value. IMHO Some Sony power supplies are very fussy and can be a pain, the KV27PSI comes to mind as well. __________________ Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member