Hey Nomad.
I was looking for you last April and i was in your area, Thank's for the get back,
I can not get up to the 34.9875Mhz. on CT3, Closest i can get it to is around 34. 9750 or so.
Now the D-37 P/N listed is a 1S2687D, This crosses to the NTE612 and the speck is 12PF, Another number listed for D-37 is the 1S2687 and it also crosses to the NTE-612,
The 3rd number for the D-37 is 1S2687 and it crosses to the NTE-614 and it's a 33PF.
I did find a seller and i got the NTE-612 and NTE-614. These diodes have no anode or cathode marking's on them so i didn't use them.
I did find some 1S1658 Varactor diodes and there spec is 32Pf and are marked anode and cathode so i ordered them and these are what i replaced D-37 with.
I did measure the original D-37 with my e-bay cheap tester and it tested at 39Pf,
The new NTE-612's are rated at 12Pf but test at 22Pf,
The new NTE-614's are rated at 33Pf but test at 24Pf,
The new 1S1657's are rated at 32Pf but test at 24Pf.
Perhaps the cheap tester isn't the correct way to test a varactor diode and i did research for a way to test these diodes and found this article on the www
https://www.qsl.net/k8gd/varactor
It's something to build and i never found anything prebuilt to test them,
This is like the el-cheapo tester i was using.
[URL unfurl="true"]https://www.ebay.com/itm/226088467722?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5336136228&customid=&toolid=10001&mkevt=1[/URL]
