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  #16  
Old 03-12-2017, 12:12 PM
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Electronic M Electronic M is offline
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The single gear that tunes the slug gears is usually (in most tuners) on a mech that only meshes it with the slug gears when turned or pushed and turned. See if you can find such a mech on the tuner....It may be gummed up.
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  #17  
Old 03-12-2017, 01:52 PM
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I thought about that, but I could find no such mechanism. The whole thing is on a pulley system, and I don't really see how pushing it in could work. I did manage to fine tune channel 3 - by taking the whole tuner out and adjusting the slug with a screwdriver. I worked on the set for about 3 hours today, and check out the image that I finally got. The purity is still bad though.

Admins, would it be possible to change the title of this thread 25MC36 instead of 25MC56? That misteak is driving me crazy.
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  #18  
Old 03-12-2017, 02:40 PM
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Nice work.

Took care of that title change for ya.

Do you have a separate serviceman's degausing coil? If so now is a good time to use it. If not You can make one out of a dead BPC CRT set easily.
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  #19  
Old 03-12-2017, 02:53 PM
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FT should be push & turn otherwise it will engage with normal
channel selecting. Dont remember them all though, SGVG
tuners most used the clothespin style FT mech or the wish bone.

Dont remember on non-SC sets but SC sets have a rocker switch
to kill the motor when it hit a channel. They would gum up
& sometimes break. Also had another disc with twist tabs for
channel skip. Also on some a blank channel was used as a TV
off position.

73 Zeno
LFOD !
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  #20  
Old 03-12-2017, 03:22 PM
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I'll take another look at the fine tuning assembly when I get back home. Thanks for the title change, Electronic M. And yes, I do have a degaussing coil, silly me didn't even think to use it. Unfortunately, I won't be able to go get those 6JH8's today, maybe one day this week after work I'll be able to go.
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  #21  
Old 03-12-2017, 03:36 PM
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April and July 1966 PF Reporters have several "Symcure" cards for your set, starting on page 8 or 9:

http://www.americanradiohistory.com/...er-1966-04.pdf

http://www.americanradiohistory.com/...er-1966-07.pdf

We always annotated them on the Sams - saved us a callback or two, I'm sure.
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  #22  
Old 03-12-2017, 06:59 PM
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I finally stopped being an idiot and PUSHED IN the fine tuning knob, and voila. Perfectly clear raster with excellent colors and good convergence. I'd say this TV's done for now. It's a perfectly watchable picture. I used the degaussing coil while the NTSC generator was set on red raster, and the purity instantly became perfect before me eyes.
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  #23  
Old 03-13-2017, 04:11 AM
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Couldn't hurt to give the pincushion controls a little tweak.

Last edited by Jon A.; 03-13-2017 at 04:23 AM.
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  #24  
Old 03-13-2017, 10:07 PM
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For such a high hour set, I'm honestly very thankful that it works this good. When I saw it in person for the first time, I was tempted to just walk. But I didn't, and I'm glad. The true quality of ZENITH has really proved itself to me on this set. I wasn't expecting to get it working this good, if ever. The quality of ZENITH has exceeded my expectations. About the pincushion, I did change the 6C4, but I forgot to adjust the control. I'll do that when I change the 6JH8's, which I'm getting tomorrow.
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  #25  
Old 03-14-2017, 10:35 AM
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check any new tubes going in for short before installing.
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  #26  
Old 03-14-2017, 10:57 AM
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You are lucky! The 25MC36 was a wonderful set. Worked on many over the years, and they are a well designed workhorse!
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  #27  
Old 03-14-2017, 03:19 PM
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Quote:
Originally Posted by DaveWM View Post
check any new tubes going in for short before installing.
Oh yes, I always check every single tube in the set before I even turn it on.
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  #28  
Old 03-14-2017, 05:55 PM
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Alright - now which one of y'all heathens came over here and broke my TV? I got home today, turned the set on, and there is NO COLOR! I replaced the 6JH8's with NOS ones, and I got the B-Y demodulator to work, but the R-Y is still dead. What gives?
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  #29  
Old 03-14-2017, 07:18 PM
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I don't have any idea how I was getting deflection on the vectorscope with a black and white image. But then, I probably didn't do something right.
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