Do these thermal fuses fail spontaneously or is there a common cause?
If the "heater" transistor mounting screws were quite loose, those transistors themselves might have overheated and failed. But, a thermal fuse should fail by high temperature...
Sounds like progress, though. Cold OCXO means low frequency. Jared, I sent you a private email with some pictures; did you get that? Larry On 11/30/2021 8:03 AM, Jared Cabot via time-nuts wrote:
Well, I found it, the thermal fuse is open circuit. If I briefly bypass it with a jumper wire, the oven pulls the expected current. Looks like I need something that will trip at roughly around 115C, rated to 1.0A (HP Part number 10811-80008) Hopefully I can find something in Akihabara to make it easier to get my hands on ASAP... Jared
... -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near Disneyland) _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
