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#1
04-22-2015, 04:10 PM
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Sony KV1204A from 1977
One of the engineers at the local TV station found this Sony KV1204A from March, 1977 on the junk floor and gave it to me. It belonged to one of the engineers, who suddenly passed away a couple of years ago, and his family never claimed any of his stuff. So, now they want it out of the way.
Besides being a little dusty, it's in nice shape and looks to have a strong CRT. The only problem I see is a near-collapse of the vertical; which, is probably due to bad capacitors. While I'm in it, I'll probably replace any electrolytic capacitors in the horizontal circuit and power supply. 
__________________
http://www.youtube.com/user/radiotvphononut 
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#2
04-23-2015, 06:25 AM
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Bryan,
Replace all 160V and 250V capacitors in the set, 7 of them IIRC. That chassis and it's brethren are all famous for the 4.7uf 160V cap in the vertical circuit failing, along with a 4.7 250V and a 33uf 160V cap in the B+, C531. The last two will cause all sorts of problems - dead set, pulling(flagging) horizontal, hum in the sound, tuning issues, and vertical rolling. The vertical sweep cap causes pulldown, collapse, or poor linearity. Once you've replaced the caps, you'll have a set that will last for years. Cheers
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit!
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#3
04-23-2015, 06:49 AM
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Hi to you both ...I have the same model except for one thing. You have a button that i don't have ( AFT button )..
Thank you findm-keepm for the explication... now i will have some work to do..
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#4
04-23-2015, 06:55 AM
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#5
04-23-2015, 10:44 AM
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Thank you for the information and I'll make a video when I get started on it.
I haven't opened it yet; but, I wonder if this is an SG-613 set or does it use a regular HOT?
__________________
http://www.youtube.com/user/radiotvphononut
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| Audiokarma |
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#6
04-23-2015, 12:00 PM
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I can't say i already asked for a schematic no one can give me the schematic of the circuits but now I know you have the same model . So if you have a schematic. i will be happy. lolllllll 
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#7
04-23-2015, 01:25 PM
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It's in Sams #1758-1, if that helps. Unfortunately, I don't have that one.
__________________
http://www.youtube.com/user/radiotvphononut
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#8
04-23-2015, 01:34 PM
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BTW, it is an SCS set - SG264A is the horiz output. They tend to stay healthy, unlike the 17 and 19"ers with the SG608 or SG613. Cheers,
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit!
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#9
04-23-2015, 01:53 PM
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#10
04-23-2015, 02:21 PM
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Thank you and I also got the needles today. I'll send you the shipping for both packages.
__________________
http://www.youtube.com/user/radiotvphononut
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| Audiokarma |
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#11
04-23-2015, 02:34 PM
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Get my drift? 
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit!
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#14
04-24-2015, 12:31 PM
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My non-working KV-1723 hasn't a hint of cataract, but the vinyl faux-wood overlay on the side is peeling up from the bottom about an 1/8th of an inch. I'll have to check my late fathers' old KV-1210 - it's in storage in his detached garage.
I'd imagine that the cataracts form with exposure to sunlight or temperature extremes more than age. Cheers,
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit!
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#15
04-24-2015, 01:14 PM
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Linear Mode
