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There are EICO and Heathkit probes up on eBay all the time - the demodulator probes that came with the EICO 145 and 147/147A work well in this application - the body is aluminum with an acrylic threaded insert at the probe tip. You can then use perfboard to mount the detector and the R-C network.
I snatched up enough probes on the 'bay to outfit my three signal tracers (one Heath, two Eicos) and one in reserrve to restore my RCA WV-77.
Perhaps someone in the forum or over on AK might have a demod probe they'd be willing to let loose. Else, search for Eico, Heath, RCA, Knight, or other "vintage" probe on eBay. Heck, even some of the newer round-style logic probes can be gutted for a probe body and tip.
Cheers,
__________________
Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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