The Crystal heater clip wasa Murata "Posistor" soldered onto a clipand they were marketed by Murata. I once purchased a small amount of theseand used them as "poor man's ovens". Although not perfect by far, they did theirjob and kept my UHF gear stable. Murata dropped that product many yearsago and I have not been able to findany similar product. The Posistors arelisted by eg. Digi-key but they do not stock them. Ulf - SM6GXV
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