Looking for some info on a majestic 463 need the second IF transformer. Ideas any one. replacement winding. etc.
thanks Luis

Antique Electronics Supply (www.tubesandmore.com) sells universal IF transformers. If the old unit is large enough, you can even stash the small new unit inside. Still, it is better to get the original working properly. Before you go buying a replacement or something like that, please tell me what is wrong with the old one. Sometimes the original coil can be salvaged. If you look hard for a break, sometimes you can mend it. Breaks sometimes happen from shorts, and then the break could be anywhere. Normally they happen from corrosion, though, which usually takes place on the outside of the coil. A couple (not a lot) of turns lost or mended will not affect the performance noticeably. Occasionally, if you're really patient and good, you can rewind them, but they're usually wound in an interwoven special way (there's a name for it, but I forgot). Winding them other than how they were originally wound will significantly affect performance.

Thomas

:Looking for some info on a majestic 463 need the second IF transformer. Ideas any one. replacement winding. etc.
:thanks Luis

I see how you could run into trouble with a direct replacement for this transformer. Originally I looked for a superheterodyne model 463 in the Majestic section, but this model does not seem to exist there (unless the file is missing). However, you will find this model and circuit diagram in the Grigsby Grunow section, which originally owned Majestic (Majestic went out of business with at least a couple of companies, and finally went out of business for good). Your IF transformer has a primary and two secondaries. One of the secondaries transfers RF signals to the detector and audio section. The second coil serves to send RF to the AVC circuit. If you cannot mend the coil that is faulty (if that is, in fact, your problem), you may still be able to salvage the coil and slightly modernize the circuit to accomidate this problem. You would have to do this modernization anyway if you switched to a replacement coil, as IF transformers for AM radios generally are not available with two secondaries unless you look REALLY HARD. If both the primary was good, and the secondary that supplies RF to the detector and audio was good, you could simply rework the AVC circuit so that it took its signal off of the detector secondary. If the coil that supplies the detector is blown, you may even be able to use the AVC coil to do both jobs, if this coil is good instead of the detector coil. Since the primary takes heavy B currents, though, I bet you're going to say that this is the coil that is blown, if, in fact that is your problem. At any rate, let me know what your problem is.

Thomas

:I see how you could run into trouble with a direct replacement for this transformer. Originally I looked for a superheterodyne model 463 in the Majestic section, but this model does not seem to exist there (unless the file is missing). However, you will find this model and circuit diagram in the Grigsby Grunow section, which originally owned Majestic (Majestic went out of business with at least a couple of companies, and finally went out of business for good). Your IF transformer has a primary and two secondaries. One of the secondaries transfers RF signals to the detector and audio section. The second coil serves to send RF to the AVC circuit. If you cannot mend the coil that is faulty (if that is, in fact, your problem), you may still be able to salvage the coil and slightly modernize the circuit to accomidate this problem. You would have to do this modernization anyway if you switched to a replacement coil, as IF transformers for AM radios generally are not available with two secondaries unless you look REALLY HARD. If both the primary was good, and the secondary that supplies RF to the detector and audio was good, you could simply rework the AVC circuit so that it took its signal off of the detector secondary. If the coil that supplies the detector is blown, you may even be able to use the AVC coil to do both jobs, if this coil is good instead of the detector coil. Since the primary takes heavy B currents, though, I bet you're going to say that this is the coil that is blown, if, in fact that is your problem. At any rate, let me know what your problem is.
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:Thomas
:You might try the following strategies:
1. There are IF transformers that use a center tapped seconday. You could possibly use half of the secondary winding for signal and the other half for AVC.
2. Take a junk IF transformer and remove one of its windings with the core intact. Then add it into your IF using epoxy or hot glue. I have done this with success. Watch the phasing however. Tom.