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Old 05-16-2018, 01:24 AM
Electronic M's Avatar
Electronic M Electronic M is offline
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WTB: Powersupply for Zenith 28F20 Porthole TV

I bought a nice Zenith table model porthole at the ETF, got as far as changing all the paper caps on the main chassis before realizing the power supply chassis is missing...Please help me complete this set. The power supply chassis I need fits chassis 28F20, 28F21, 28F22, 28F23 and 28F25. Willing to give good money for one regardless of condition, as long as the transformers and chokes are present and good.

You can see pictures of one in the second to last page of the Sam's linked below.
http://www.earlytelevision.org/pdf/z...sams-64-15.pdf
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Old 05-16-2018, 12:06 PM
dieseljeep dieseljeep is online now
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Quote:
Originally Posted by Electronic M View Post
I bought a nice Zenith table model porthole at the ETF, got as far as changing all the paper caps on the main chassis before realizing the power supply chassis is missing...Please help me complete this set. The power supply chassis I need fits chassis 28F20, 28F21, 28F22, 28F23 and 28F25. Willing to give good money for one regardless of condition, as long as the transformers and chokes are present and good.

You can see pictures of one in the second to last page of the Sam's linked below.
http://www.earlytelevision.org/pdf/z...sams-64-15.pdf
I'll call tonight to see if a friend wants to sell his, an entire set.
I only saw one of those! It was one I never desired, even though it was Zenith's first set.
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Old 05-17-2018, 10:36 AM
kramden66 kramden66 is offline
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I once had a similar problem - no power chassis so a friend suggested I could make one as long as I found a transformer with similar voltages , he made a schematic for me to use too , thankfully the person I got it from found the chassis , so in a pinch you could build your own , might not be original but could be made .
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Old 05-17-2018, 10:51 AM
dieseljeep dieseljeep is online now
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Originally Posted by kramden66 View Post
I once had a similar problem - no power chassis so a friend suggested I could make one as long as I found a transformer with similar voltages , he made a schematic for me to use too , thankfully the person I got it from found the chassis , so in a pinch you could build your own , might not be original but could be made .
According to the Sams, the power transformer is somewhat special. It has a tapped HV winding for two B+ voltage levels so the O/P would possibly have to use two power transformers, no big deal.
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Old 05-17-2018, 12:10 PM
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Originally Posted by dieseljeep View Post
According to the Sams, the power transformer is somewhat special. It has a tapped HV winding for two B+ voltage levels so the O/P would possibly have to use two power transformers, no big deal.
I take it you struck out with your friend. I considered making a supply, but it is so cramped in the cabinet I can hardly figure out how the original mounted, and I don't have a chassis that would fit what I presume was the place it belongs....
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Old 05-17-2018, 04:18 PM
kramden66 kramden66 is offline
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It mounts on the side looking from the back on the right side , if I still had the schematic I'd give it to you , just mount it all on a piece of wood , ofcourse no 5u4 but diodes .
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Old 05-17-2018, 08:24 PM
dieseljeep dieseljeep is online now
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Originally Posted by Electronic M View Post
I take it you struck out with your friend. I considered making a supply, but it is so cramped in the cabinet I can hardly figure out how the original mounted, and I don't have a chassis that would fit what I presume was the place it belongs....
I'm going to his place tomorrow. He kinda wants a little hefty price. I told him that the CRT has to be really good for that kind of money.
I'll let you know more tomorrow, when I get back.
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Old 05-17-2018, 10:15 PM
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You will need a power supply specific to a table model set, not one from a console. The table model supplies incorporate additional shielding due to close proximity with the main chassis.

Last edited by John Marinello; 05-21-2018 at 02:28 PM.
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Old 05-18-2018, 10:06 AM
dieseljeep dieseljeep is online now
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Quote:
Originally Posted by Electronic M View Post
I bought a nice Zenith table model porthole at the ETF, got as far as changing all the paper caps on the main chassis before realizing the power supply chassis is missing...Please help me complete this set. The power supply chassis I need fits chassis 28F20, 28F21, 28F22, 28F23 and 28F25. Willing to give good money for one regardless of condition, as long as the transformers and chokes are present and good.

You can see pictures of one in the second to last page of the Sam's linked below.
http://www.earlytelevision.org/pdf/z...sams-64-15.pdf
The set my friend has is a console. I'll ask about it anyway!
The set shown in the Sams has an Aluminized CRT. It looks like it says "Hytron" on the base.
Must be before Zenith bought Rauland.
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Old 05-18-2018, 01:29 PM
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For reference, here is a photo of the P/S in my table set.
Attached Images
File Type: jpg DSC_1878.jpg (79.6 KB, 31 views)
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Old 05-19-2018, 01:01 PM
dieseljeep dieseljeep is online now
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For reference, here is a photo of the P/S in my table set.
That is one big mudder of a P/T for a small screen set. Slight overkill.
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  #12  
Old 05-19-2018, 02:48 PM
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Originally Posted by dieseljeep View Post
That is one big mudder of a P/T for a small screen set. Slight overkill.
And that transformer is strictly for B+ and the filaments of the 5U4s that create it...There is a SECOND good sized one under the main chassis for the heaters of the main chassis. It is a brick outhouse!
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