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#347
08-20-2011, 10:45 AM
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Quote:
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#348
08-20-2011, 05:31 PM
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Lower. Thanks for not giving it away too much.
 http://www.youtube.com/watch?v=yU6BfOV4_fc Pay no attention to the massive explosion at :14, they are filming Batman directly outside of my window. Still much work to be done!
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#349
08-20-2011, 06:47 PM
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Yay!! What a difference one little part can make.
Phil Nelson
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#350
08-20-2011, 07:09 PM
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Well done, Mr. Dragonslayer! I gotta congradulate you on your tenacity and perseverance. That set started out with multiple and disparate problems, and contains some novel/'oddball' pre-standardization circuit fratures. It would have been a signifigant challenge even for a seasoned techie. She's definitely on the home stretch now.
Was that the Batmobile backfiring outside? 
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#352
08-20-2011, 08:03 PM
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Hmm.. seems to be a vid of it here (after the #!@$%^&* commercial) -
http://www.wpxi.com/video/28907146/index.html But still trying to figger out what a tumbler is. 
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#353
08-23-2011, 01:05 PM
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Home Stretch it is!
After much adjustment of front and rear controls I've got is as linear as I could. A couple notes: the sound is terrible, I have to turn the set up much too loud to hear anything. The video below shows what happens to the picture when I adjust the contrast control. The video starts with the contrast cranked all the way up then some adjusting from all the way up to all the way down a few times. http://www.youtube.com/watch?v=jVzPM6IlFeE One other thing I've noticed is that the picture isn't level, it slopes from left to right. Is there an adjustment for that, or is it a symptom of another problem?
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#354
08-23-2011, 05:01 PM
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 The bending when you turn up the contrast is related to the rather primitive sync take off scheme; it picks the sync off after the contrast control, after the video output stage in fact. Bending and "flagging" with an overly strong signal or high contrast is generally just part of the charm of such early designs. Does it straighten up if you reduce the signal strength at the antenna input? To level the picture you rotate the yoke. There has to be something to loosen so the yoke can turn, then you tighten it again. On the low sound, have you replaced C4, the little 4 mfd electrolytic that connects to pin 2 of V9 (the 6T8 tube)?
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#355
08-23-2011, 08:11 PM
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http://www.youtube.com/watch?v=CgN4siWzFGo We are so very very close to  .Just some audio tweaking and getting rid of retrace lines to go.
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#356
08-23-2011, 08:30 PM
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Congrats! Almost there!
(BTW, I was listening to Let me hear you scream by Ozzy while I was watching that video... made for an interesting combo, and fit creepily well at times.)
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#357
08-23-2011, 08:31 PM
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 Yeah, you always gotta watch the polarity of diodes. The banded end denotes the cathode. That's universal practice AFAIK. The retrace lines may go away at lower brightness setting. There doesn't appear to be any retrace blanking. Another 'charm' of some early sets.
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#359
08-24-2011, 01:03 AM
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#360
08-24-2011, 02:35 AM
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If you're going to chance tweaking the audio IF "by ear," without following the factory procedure, you can make a little flag of tape for your screwdriver handle. Note which way it points when you begin, and then count how many half turns (or whatever) you go in a given direction. That way, if your adjustment makes no difference, or it makes things worse, you have a way back to Kansas.
Phil Nelson
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Linear Mode
