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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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19th Aug 2006, 9:02 pm | #1 |
Retired Dormant Member
Join Date: Oct 2003
Location: Halesworth, Suffolk, UK.
Posts: 413
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SONY 9-90UB hum (intercarrier buzz)
Hi
I have now located a set of knobs for this set, this just leaves the problem of hum on sound! This happens when the camera changes shots so sound is OK, then a camera change starts the hum and then this goes off when the camera changes shots again. I know nothing at all about transistor TVs - does anyone know what is causing this fault? |
19th Aug 2006, 11:56 pm | #2 |
Dekatron
Join Date: Sep 2003
Location: Bolton, Greater Manchester, UK.
Posts: 6,644
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Re: SONY 9-90UB Hum
These again. I must be missing something with these - ah well....
This problem was common on valve sets too - ever worked on a Thorn 1400 ?, there were tons of mods for this. Now there's an open door for memories! Anyway, it's called Vision on Sound Buzz, and it's noticably annoying as a camera change will set it off or stop it. The two diodes are D403 and D404. These come out of a variable coil thing. Give that a tweak. Cheers, Steve P P.S. Getting to it is your problem....!
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If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...? Last edited by Steve_P; 20th Aug 2006 at 12:04 am. |
20th Aug 2006, 1:58 pm | #3 |
Retired Dormant Member
Join Date: Oct 2003
Location: Halesworth, Suffolk, UK.
Posts: 413
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Re: SONY 9-90UB Hum
Steve many thanks for extra info, I will prob start another thread on the 1400 regards TVden
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