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Kevin Kuehn 10-23-2016 08:45 PM


Originally Posted by Big Dave (Post 3172286)
Zenith flyback S-46564. Triad D-197, Merit HVO 196. Need thordarson if you can.

Fly 217.

Big Dave 10-24-2016 08:01 PM


etype2 11-27-2016 02:08 PM


Originally Posted by Kamakiri (Post 3112367)
I managed to pick up some pretty complete Thordarson Meissner, Miller, Stancor, and Workman parts catalogs recently, so we might as well put them to use :)

If you have a set that needs a part and you need a part number, post it here and I'll do my best to look it up. Model numbers, chassis numbers, and OEM part numbers help out quite a bit in finding the correct applications.

If you have a part but don't know what it fits, I'll do my best to ID it.

Most of my catalog listings end around 1963 or so, but I'll do my best....

Your comments, suggestions much appreciated.

Mike Doyle is helping me restore my RCA 21CT55. Some of you may know him.

The RCA Part number is 78987. It is described in the parts list as the 43.5 MHZ link transformer L2. The parts list does not describe it as also being one of the 41.25 MHZ traps but it states that on the schematic and also in the alignment instructions. It is in fact, both the link and the trap.

Mike found a problem with the first stage of the I.F. strip. The 1rst I.F. grid transformer (T106) does not tune properly. There are 2 cores in it, one for the top and one for the bottom part of the transformer. The one on the top does not tune. He suspects that the powdered iron core is sitting in the bottom of the coil and has become separated from the screw that is normally attached to it and positions it in the coil core. This will be a very delicate piece of surgery. The transformer will have to be removed from the set, disassembled and examined. There are 2 possible scenarios here. Scenario one is that he can successfully repair the coil and scenario two is that he cannot. We will not know until we "go" there. If we cannot then we will have to build a circuit that will take its place using newer materials possibly from a newer chassis. Theoretically, this stage could be mostly eliminated since there are traps of the same frequency in the last stage of I.F. to do the job.The purpose of the 41.25 MHZ trap is to trap out the adjacent channel sideband and since I will be using a modulator to view images it makes this issue a lot less critical. But we really want to do this right and fix the transformer if we can. It is hard to say when this actually happened. It could have happened on its way across the country while in the truck or it could have been that way for many years and picture quality was unknowingly sacrificed. Either way, we are very happy to have found this problem. Now we have to figure out how to deal with it.

We are reaching out to this community. Your opinions, is this doable, or dose anyone have a replacement?

Thank you in advance.

Kevin Kuehn 11-27-2016 07:17 PM

RCA 78987 crosses to Thordarson 17-4518.

Same seller seems to have a whole slew of TV IF's and traps.

etype2 11-27-2016 07:50 PM


Thank you very much for the link. We will get on it.


etype2 11-27-2016 10:52 PM

From Mike: "I nabbed both of the ones that he had for sale.

Thanks, Mike

And a special thanks to Kevin please pass that on for me!"

Same from me.:-)

Kevin Kuehn 11-28-2016 01:59 AM

You're both welcome. I'm always a little apprehensive about whether the Thordarson cross reference is always correct, but by looking at that ebay listing, this one does seem to fit Mike's description.

etype2 12-06-2016 12:45 AM


Good news. Mike received the new I.F. transformer today and it is an exact replacement. All pin configurations were the same as the old one. Thordarson Meissner company did it right!. Thanks again.

Rich12 03-13-2017 10:18 PM

flyback replacement
Anyone know of a replacement for an Emerson 735015 horizontal output transformer. A Thordarson replacement would be helpful, many of them on ebay.

Findm-Keepm 03-14-2017 09:18 AM


Originally Posted by Rich12 (Post 3180552)
Anyone know of a replacement for an Emerson 735015 horizontal output transformer. A Thordarson replacement would be helpful, many of them on ebay.

Crosses to Thordarson Fly-1

fixmeplease 03-23-2017 01:53 PM

Need cross reference #s for Philco 32-8624 flyback. Circa 1953. Triad D-70 "might" be one. Thordarson is the main one Im looking to find.

Electronic M 03-23-2017 03:39 PM

Is that for a split chassis set? If so I have a spare HV chassis from a parted out split chassis set that may have what you need.

fixmeplease 03-23-2017 05:24 PM

Yes, its split chassis but yours may have a different flyback. Mine is some freak that as far as I can tell there is no schematic for the half with the flyback. The back says the chassis number is 53-T1854 however does not match that schematic or any other I can find. The other half mostly matches the schematic. I had it running pretty good after recapping but had snaps at startup with nothing I could see top or bottom when it did it. While adjusting the horizontal it started snapping quickly and I lost the HV. Ive pretty much narrowed it down to the flyback and if I did the continuity test correctly it is bad. But yes, I will take you up on it if you have the correct part! Thank you! Let me know when you find time to look.

miniman82 03-23-2017 05:38 PM

Philco split chassis are notorious for having multiple chassis runs for the same model number of set, you just need to get the correct schematic for the run you have. Snapping can be caused by nearly endless things, did you clean all the dust and crud out of the HV cage?

fixmeplease 03-23-2017 06:57 PM

I think I found all the different schematics online for the year with none matching that half. Theres an extra tube, a 12B4, in the very front that isnt on them, and the other wiring different, just on the half with the flyback. I was just really careful during replacement of things. Its run 17 I think. The snapping noise was coming out of the speaker, but it was not visible anywhere. I started it repeatedly looking everywhere for the source in the dark. Then I lost HV. the snap was internal. Everything is pretty clean, blown and brushed off. I think its one of their higher priced models as it is quite fancy on the front. 17" crt.

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