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#1
02-17-2015, 09:28 AM
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66 motorola contrast issue
i have a 1966 motorola 23 inch and if i turn the contrast to make the picture sharp the screen pulls in on one side. this set was recapped and works great its just the contrast if i want to make it sharper and as i turn it in that direction the screen pulls in. any ideas ......
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#3
02-17-2015, 10:22 AM
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Did you check the 3AT2? It might be blooming! It's been ages, since I worked on one of them. Also, the 6LY8 was overworked in that chassis. Try replacing it.
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#4
02-17-2015, 10:52 AM
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it is a color set and there is no 6Ly8 maybe a different one ? the chassis is a 908 and i have the schematic that covers both aets908ye and the ets908ye. this is the set that uses 2 hots. it does seem to bloom when the contrast is turn to make it sharper.
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#6
02-18-2015, 01:14 PM
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One day, it started blooming and going out of focus. Both the 3AT2 and the 6BK4 were weak. That was when the set was around 7 years old. We only ran it for 10 years, until the original 23EGP22 got too weak to produce a decent picture. The video output tube in that chassis is a 6HB6.
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#7
02-18-2015, 02:11 PM
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yes this chassis does look over built and it does look like the hv is not regulating and this is the cause but for now it has a great picture even when certain scenes show the hv dips to 19kv but is still bright and clear and dont bloom. maybe because the crt is in great shape as it was replaced in december 1980. i did try another rectifier tube and hv reg tube no change . so one day maybe ill tackle it but for now it only goes on maybe 3 times a year.
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#9
02-18-2015, 02:29 PM
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Timmy ,
Please post a picture of this set. I had a metal cabinet TS914 once but this is a bit older. Mine had the color indicator light and the "tint" control. It had a good 23EGP22, rare as they are.
__________________
"When resistors increase in value, they're worthless" -Dave G
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#10
02-18-2015, 02:53 PM
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#11
02-18-2015, 03:13 PM
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Last edited by timmy; 01-19-2016 at 10:23 AM.
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#12
02-18-2015, 05:55 PM
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-WOW- That is a nice tv ! !
I think the problem is that Timmy sucks HV right out of whatever tv he is next to-  A good 23EGP22............... Timmy has a time machine too..........? That is a really nice cabinet...... Real wood....? .
__________________
Yes you can call me "Squirrel boy"
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#13
02-18-2015, 07:29 PM
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__________________
"When resistors increase in value, they're worthless" -Dave G
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#14
02-18-2015, 07:52 PM
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Yeah, from what I've red here I'd estimate the number of good 23EGP22s known to exist at around 10.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#15
02-19-2015, 07:03 AM
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well this motorola has been for sale if anyone may be interested, i would let it go for what i have in it. i bought this from a VK member a few years back and i got 225.00 in it , tubes, caps and the price for it, it may be more but i dont remember. this problem with the hv regulation in the beginning i thought it may have been the flyback and or the yoke so i got both from moyers the yoke i didnt put in but the fly i did so now i know what the problem is and its got a new fly and a spare as well as a spare yoke and i didnt add these items to what i have in this set. so if someone offers 225.00 for it i will take it.
Last edited by timmy; 02-19-2015 at 08:31 AM.
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