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  #1  
Old 08-31-2015, 09:46 PM
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WTB: 1964 Zenith cloverleaf roundie convergence coils

Hope I didn't miss the right place to post.

Anyone familiar with the early Zenith roundies will recognize the reason for this want ad - the convergence magnet assembly "cloverleaf" on my '64 "coffin" combo is really brittle - cracked in two places and held together with tape and tie wraps. Any more age and stress and it probably is gone forever. Afraid to tighten it down at this point. Actually I have another one in a restorable set that is just as bad, but would settle for one not so bad for now.

So, looking for one in better shape to buy. Any parts out there?



While we're on the subject, looking at these things makes me wonder if a 3-D printed replacement is feasible.
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Last edited by old_tv_nut; 08-31-2015 at 09:49 PM. Reason: fix title
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Old 08-31-2015, 10:00 PM
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Quote:
Originally Posted by old_tv_nut View Post
Hope I didn't miss the right place to post.

Anyone familiar with the early Zenith roundies will recognize the reason for this want ad - the convergence magnet assembly "cloverleaf" on my '64 "coffin" combo is really brittle - cracked in two places and held together with tape and tie wraps. Any more age and stress and it probably is gone forever. Afraid to tighten it down at this point. Actually I have another one in a restorable set that is just as bad, but would settle for one not so bad for now.

So, looking for one in better shape to buy. Any parts out there?



While we're on the subject, looking at these things makes me wonder if a 3-D printed replacement is feasible.
I've got a buddy in the plastics business - he may know what plastic would be best - ABS softens (he has an ABS vacuum forming machine with a 440V 6'x8' heater), so it would probably be a composite plastic of some sort. It seems if a 3D printer can soften the filament, so would the neck temperatures.

I'm gonna ask - and no, I have no Zenith cloverleaf, or knowledge of where to find one.
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Old 09-01-2015, 08:28 AM
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Quote:
Originally Posted by Findm-Keepm View Post
I've got a buddy in the plastics business - he may know what plastic would be best - ABS softens (he has an ABS vacuum forming machine with a 440V 6'x8' heater), so it would probably be a composite plastic of some sort. It seems if a 3D printer can soften the filament, so would the neck temperatures.

I'm gonna ask - and no, I have no Zenith cloverleaf, or knowledge of where to find one.


A few of us were thinking about reproducing this and many other parts like RCA yoke covers with a 3D printer
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Old 09-01-2015, 11:12 AM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by old_tv_nut View Post
Hope I didn't miss the right place to post.

Anyone familiar with the early Zenith roundies will recognize the reason for this want ad - the convergence magnet assembly "cloverleaf" on my '64 "coffin" combo is really brittle - cracked in two places and held together with tape and tie wraps. Any more age and stress and it probably is gone forever. Afraid to tighten it down at this point. Actually I have another one in a restorable set that is just as bad, but would settle for one not so bad for now.

So, looking for one in better shape to buy. Any parts out there?



While we're on the subject, looking at these things makes me wonder if a 3-D printed replacement is feasible.
What would be wrong with replacing the entire convergence magnet assembly, unless you want it to be super-pure!
Just the magnet assembly, not the convergence control panel. The magnet coils must be about the same or close.
IIRC, I have two of the last Zenith roundies and they have the same style coils as Magnavox and others. You know, the ones with the color-coded coils.
The replacements, I bought ages ago, were made of a different color plastic.
The Zenith distributor in Milwaukee, had just about everything you ever needed for the repair of Zenith products.
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Old 09-01-2015, 02:10 PM
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Originally Posted by dieseljeep View Post
What would be wrong with replacing the entire convergence magnet assembly, unless you want it to be super-pure!
Just the magnet assembly, not the convergence control panel. The magnet coils must be about the same or close.
IIRC, I have two of the last Zenith roundies and they have the same style coils as Magnavox and others. You know, the ones with the color-coded coils.
The replacements, I bought ages ago, were made of a different color plastic.
The Zenith distributor in Milwaukee, had just about everything you ever needed for the repair of Zenith products.
Of course I meant the whole assembly. Although the frame itself might be sufficient, I'm not sure why anyone selling the frame would want to keep the coils without it. So, anything that fixes my problem.
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Old 09-01-2015, 03:01 PM
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Question: I always hear about these things breaking apart on people, is it not possible to use the assembly off an RCA or other set? None of the ones on any of my sets are breaking down, seems like a more permanent fix is in order.
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Old 09-01-2015, 03:11 PM
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I don't know if different makers had different coils / inductances driven to different currents with different driving voltages. Eventually, the magnetic fields in the tube should be the same, but you might get the fields with lower current / more turns or higher current / fewer turns.
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Old 09-02-2015, 05:56 PM
tvdude1 tvdude1 is offline
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I found 2 from Moyer last month
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Old 09-02-2015, 06:02 PM
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what search terms do you use?
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Old 09-04-2015, 08:09 PM
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Moyer electronics in P.A. They have 3 stores ask for Bill he knows his old tvs
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Old 09-05-2015, 05:34 PM
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Moyer electronics in P.A. They have 3 stores ask for Bill he knows his old tvs
Thanks.

Currently in the throes of closing on a house, haven't had time to even touch the set since Doug was here to plug it all back together.
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Old 09-08-2015, 10:38 PM
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Wayne,
I have a NOS cloverleaf I'm saving for that "yet to find Zenith".
You are more than welcome to use it as a model for making reproductions.
PM me if interested.
Phil
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Old 09-09-2015, 02:51 PM
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That might be an interesting project IF I was retired already.
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Old 09-09-2015, 03:11 PM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by reeferman View Post
Wayne,
I have a NOS cloverleaf I'm saving for that "yet to find Zenith".
You are more than welcome to use it as a model for making reproductions.
PM me if interested.
Phil
What color is it? IIRC, the replacements were a different color than the originals.
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Old 09-09-2015, 11:34 PM
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Nope, same color.
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