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#16
12-18-2008, 10:06 PM
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Just got time to look at 'er, the bay is blocked at work. Very nice! You HAVE to post some pics when you get it all fixed up. Don't make me come down there!
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My TV page and YouTube channel Kyocera R-661, Yamaha RX-V2200 National Panasonic SA-5800 Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20 Pioneer SX-939, ER-420, SM-B201 Motorola SK77W-2Z tube console McIntosh MC2205, C26 
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#17
12-29-2008, 04:18 PM
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Well, got the l'il guy in today. Kinda dirty, but all the knobs are there, screen isn't skint up, only a couple tiny dents-but hell, this bad boy IS from 1959-60 or thereabouts. Should I bring it up on a variac, or does that work for solid state stuff ? Or should I leave well enuff alone, just clean it good, & wait til I can take it down to visit Terry ?
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Benevolent Despot
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#18
12-29-2008, 04:24 PM
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Well, I'm no TV guy, that's for sure, but here's what I'm thinking...
The recommendation on an old radio is to always replace the caps before firing up, because you could be putting 200-300 volts of B+ on those old caps. If they're shorted, you could be kissing a transformer goodbye. TV's, now, they might only have a coupla kilovolts running around in there... If it were me, I wouldn't plug it in, even to a variac. Too many unobtainium parts in there to risk it. 
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I may be growing older, but I refuse to grow up. 
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#21
12-29-2008, 11:28 PM
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If you do it right, you could make a killer mouse cage out of that. It has a handle and everything.
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_______________________________ All there is to life is beer and music.... Well, family too, but they are where the beer and music is. Work? That's just to get me to the weekend.... where the beer, music and family are. Like I said, those are the important things.
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#22
12-30-2008, 12:50 AM
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Quote:
I got two of these working last year.Watch out for the horizontal output transistor running very hot,if it does-change it.2SC41. Other thing to watch out for is sync problems,rolling pix etc. Hugh
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#24
12-30-2008, 05:16 AM
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Hi
One of the 8-301's I have had terrible sync.Would "lock" on a strong signal but then lose sync etc. I found from looking at the sync part of the middle board that a resistor had never been fitted in manufacture.No resistor,no solder,just the holes in the pcb! From memory it was around 10K.Fitted it and lock was then great! Maybe check that and also the resistor values are as the schematic indicates. A good test of the sync is to reduce the RF gain(contrast) control and see if the picture keeps locked in.Have a video of mine on youtube here http://uk.youtube.com/watch?v=StbCuB...e=channel_page Strangely both of mine have weakish vertical lock if the horizontal hold is at one extreme or other of the lock in range.Don't know why this is. Hugh
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#26
12-30-2008, 06:51 AM
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Strange you had to add the resistor too.
The difference when I put it in was fantastic. Seem to remember there was video getting thru the sync stages without it.Waveforms are on the SAMS schematic. Getting access to the panel is difficult though to measure anything!! The other one already had the resistor fitted and sync seems ok.Both sets lock down to virtually no signal on the screen. There is some hor osc frequency drift as the TV warms up in the first 15 mins or so. Once working the TV seems reliable Hugh
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