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42-321 model variations, schematic needed
#6

Yesterday, I took the 11" x17' scheamatic I had printed, and went through the chassis wire by wire, and component by component. I again confirmed that I had not made any error replacing almost all of the wires, the capacirtors, and several of the resistors. I resoldered a few connections, and cleaned or recleaned tube pins. I tested the 7A8, and replaced it with a better one I had in another radio (it was weak in the amplifier section, OK in the oscillator section). I set-up to align it, and set the IF cans, then found that it was still not oscillating, as grounding the oscillator section of the tuning gang capaciator did not make any difference. I then decided to parallel the oscillator coil from the parts radio with the one in it, and that showed that the original oscillator transformer was bad! I changed the transformer, and the radio worked OK. However, I was still not finished, as the original speaker had a bad buzz. I replaced it with the speaker from the parts set, and it sounds nice, and picks up many stations very well!

I don't know why the right side of the photos are cut off on this forum, but you can see the complete photos on my Photobucket account - FStephenMasek.

[Image: http://i269.photobucket.com/albums/jj77/...e006-5.jpg]

[Image: http://i269.photobucket.com/albums/jj77/...ure014.jpg]

[Image: http://i269.photobucket.com/albums/jj77/...e008-7.jpg]

[Image: http://i269.photobucket.com/albums/jj77/...e001-9.jpg]

[Image: http://i269.photobucket.com/albums/jj77/...ure002.jpg]


Messages In This Thread
Re: 42-321 model variations, schematic needed - by Guest - 10-30-2009, 04:47 PM
Re: 42-321 model variations, schematic needed - by FStephenMasek - 11-11-2009, 10:06 PM



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