Sony TV9-306 Line linearity - UK Vintage Radio Repair and Restoration Discussion Forum

beery · 5th Jun 2025, 3:42 pm

Hi folks,
does anyone have a Sony manual and can look up the setting of the two adjustable capacitors in the line output stage please?

On trader sheet 1803 they are referred to as C811 and C813. I've replaced the LOPT on my set, but the line linearity isn't right. I wondered if the Sony manual gives any clues about how to cure it and if adjustment of C811 and C813 is involved.

Cheers
Andy

patrickgnl · 5th Jun 2025, 4:05 pm

The service manual is available here

Mr Hoover · 6th Jun 2025, 5:43 am

Check the value of the large yellow
S correction capacitor near the scan coils,
supposed to be 3.3uF I think but may have
dropped, I think changing that may help.
They all do seem to suffer from line
linearity issues to an extent.

Niechcial,Steve · 27th Aug 2025, 12:20 pm

Yes, I've never seen one of these without a line lin. problem. Most of them have excessive width on 625 too.

Maarten · 28th Aug 2025, 11:56 pm

According to the parts list, C816 is a paper capacitor so that will very likely be faulty in some way. I can't seem to find it in the schematic, but C8xx are all in the horizontal stage.

5th Jun 2025, 3:42 pm	#1
beery Heptode Join Date: Jun 2006 Location: Ware, Hertfordshire, UK. Posts: 991	Sony TV9-306 Line linearity Hi folks, does anyone have a Sony manual and can look up the setting of the two adjustable capacitors in the line output stage please? On trader sheet 1803 they are referred to as C811 and C813. I've replaced the LOPT on my set, but the line linearity isn't right. I wondered if the Sony manual gives any clues about how to cure it and if adjustment of C811 and C813 is involved. Cheers Andy __________________ www.youtube.com/user/andyvalve100

5th Jun 2025, 4:05 pm	#2
patrickgnl Pentode Join Date: Jun 2016 Location: Stourbridge, West Midlands, UK. Posts: 123	Re: Sony TV9-306 Line linearity The service manual is available here

6th Jun 2025, 5:43 am	#3
Mr Hoover Hexode Join Date: Jan 2007 Location: Faro, Portugal Posts: 291	Re: Sony TV9-306 Line linearity Check the value of the large yellow S correction capacitor near the scan coils, supposed to be 3.3uF I think but may have dropped, I think changing that may help. They all do seem to suffer from line linearity issues to an extent.

27th Aug 2025, 12:20 pm	#4
Niechcial,Steve Hexode Join Date: Jan 2007 Location: Beckenham, London, UK. Posts: 398	Re: Sony TV9-306 Line linearity Yes, I've never seen one of these without a line lin. problem. Most of them have excessive width on 625 too.

28th Aug 2025, 11:56 pm	#5
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,722	Re: Sony TV9-306 Line linearity According to the parts list, C816 is a paper capacitor so that will very likely be faulty in some way. I can't seem to find it in the schematic, but C8xx are all in the horizontal stage.