Quote:
Originally Posted by wa2ise
Sometimes the open happens at the spot where the enamel magnet wire is soldered to the lead wire. The old rosin sometimes corrodes the wire, causing the break. You could dig into the outer paper tape wrap to see if that might be the case. At this point the transformer would be trash if that's not the cause anyway, so nothing lost.
As for the output primary showing twice the resistance listed, well sometimes the schematic services have errors. Or the manufacturer made a production change. But T2's primary being open would kill the vertical. So pay that more attention.
Vertical transformers are somewhat similar to audio transformers, and also power transformers. Getting the turns ratio close enough would be trial and error, also getting the phasing correct is important. I don't know what turns ratio and impedances would be correct, or what would be close enough, so it would look like black magic...  |
It's a blocking oscillator. I wonder if they rely on the core saturating? Sams only gives a Majestic part number for it so it might be difficult to find a replacement.
I think your point about the connection at the lead is a good one. I've seen that a couple of times. Refresh my memory. The primary is usually the inside winding isn't it?