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 Post subject: Source for new construction vintage TV flyback transformers
PostPosted: Sep Fri 24, 2021 1:49 am 
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Joined: Sep Wed 22, 2021 11:55 pm
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Location: San Francisco, California, USA
I see many places that make and sell new, high end tube audio transformers, but are there any places that make and sell new non-solid state tube TV transformers, especially flyback transformers?

When working on vintage TVs, new vacuum tubes are plentiful, but new old stock flyback transformers are unobtainable for many models. There are a few aftermarket transformers from Triad and Thordarson, but they are not compatible with many of the models. The characteristics of a flyback transformer that is used in a non-solid state all tube TV are very different from the characteristics of a flyback transformer used in a solid state CRT TV. For example, a non-solid state, all tube TV uses the flyback transformer to do impedance matching between the horizontal output amplifier tube and the horizontal yoke on the CRT, similar to how an audio transformer is used to impedance match the output amplifier tube to the speaker. For this reason, the very plentiful solid state CRT TV flyback transformers are useless for even attempting to retrofit into a vintage TV.

Any help or suggestions would be appreciated.


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 Post subject: Re: Source for new construction vintage TV flyback transform
PostPosted: Sep Fri 24, 2021 1:58 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Detroit, MI USA
The bottom line is there is so little demand for such transformers that it would not be profitable for a company to offer that service. It would cost too much to set up and wind each one to order, and there were literally thousands of different and non-interchangeable TV flybacks in the tube era.

A few skilled individuals have rewound defective HV windings or transplanted a good one from a different make and model onto the core from another one, but that's not always possible.

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 Post subject: Re: Source for new construction vintage TV flyback transform
PostPosted: Sep Fri 24, 2021 4:08 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 11105
Location: Sunbury, Ohio 43074
Have you tried the ETF museum in Hilliard Ohio? They have a lot, and links to others on their site

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 Post subject: Re: Source for new construction vintage TV flyback transform
PostPosted: Sep Sat 25, 2021 3:23 am 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 11013
Location: Long Island NY
I was doing TV repair back in the late 1970s and early 1980s. Even back then the only time somebody changed a flyback on a vacuum tube TV was because it was in a big furniture console, and the customers wanted to keep the furniture. On portable and tabletop tube TVs, a bad flyback was usually a death sentence; such sets could easily be replaced with new solid state color ones for less than the cost of repair. The parts distributors only kept the most popular replacement flybacks on the shelf but they could still order them for many tube TVs from the mid-1960s and 1970s. For most sets older than that, flybacks were usually NLA, and I don't imagine they've become more available in the 40 years since.

The reason we can still get some replacement power transformers and audio outputs is because those are based on current production transformers. The steel laminations and core bobbins go into numerous transformers of current manufacture, so it isn't difficult for a company like Hammond to simply do a run with the right turns radios for the tube audio and antique radio crowds. A tube television flyback, on the other hand, only goes into a tube television--and very often only one make and maybe a few models of tube TVs. So if none of those TVs still exist--or they do but don't need new flybacks--then who are they going to sell replacement flybacks to? There is no current application for transformers of that type, so they cannot "piggyback" the production onto something else.

What I would suggest to anybody interested in old tube TVs is to gather up all the Thordarson, Triad, and other catalogs you come across. Every once in a while somebody comes across NOS replacement flyback transformers and you'll see them for sale on line or at swap meets. The catalogs will help you identify what sets they go to.

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 Post subject: Re: Source for new construction vintage TV flyback transform
PostPosted: Oct Sat 02, 2021 2:57 pm 
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Location: Beaver Falls, PA. USA
The last flyback transformers that I can remember changing were the infamous RCA units, back in the early 1980s. Not much demand for them now.

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