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Post by 238 on Jun 30, 2022 8:40:52 GMT -5
Was given this receiver. Someone had moved the 31.400 crystal too a switch on the back, so they could add another crystal. They removed that crystal, but left the 31.400. I removed the switch an put a new crystal back on the tube socket. Changed all the caps and resisters on the 6AQ5 tube. receiver is working better, but still needs work.Jim/238
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Post by 238 on Jun 30, 2022 8:51:00 GMT -5
Checked the big cap. With it still wired in the receiver it read 37a 68.4/ 37b 96.1/ 37c 82.6. Do i need to unsolder the wires to get a correct reading? Jim/238
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Post by 2600 on Jun 30, 2022 22:58:57 GMT -5
Those readings indicate the filter caps are not in trouble. Not this week.
That radio is old enough to have "K-Tran" IF transformers. Easy way to tell is look down the hole in the top of the can. If it has a slug with a hex-shaped hole, that one's probably okay. What you're watching for is a shallow slot that takes a screwdriver-tip shaped tool.
That one is the dreaded "K-Tran". They will famously become intermittent and drop the signal level into the basement. First hint is that turning the tuning slug won't reveal a clear peak.
If I had real money, I would be tempted to develop a drop-in replacement for those. Nobody has the later types with the hex-shaped hole. That's what we replaced them with when they were available. Until everybody finally ran out.
73
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Post by 238 on Jul 13, 2022 8:46:04 GMT -5
I got the receive working ok now. I think when they put the HF crystal in they moved the L6 & C49 too get the new channels. All i got to use wright now is the spot button for frq. Moved C49 a tad got channel 20 close. But ch 1 will not spot, go to ch 23 an it will spot. I got to go find me a signal gen. Jim/238
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Post by holydvr1776 on Jul 13, 2022 15:54:42 GMT -5
Bad or missing crystals?
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Post by 238 on Jul 13, 2022 20:38:56 GMT -5
This is a receiver only has one crystal. It is new. Jim/238
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Post by holydvr1776 on Jul 14, 2022 4:04:05 GMT -5
Dang! I misread the title. Facepalm.
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