I've not found this to be a problem. I simply turn mine on 5 minutes before I need it. If it was necessary to run it for weeks, I'd find a way to use an OCXO or GPSDO instead.
It's a bit different with the old-style Rb References such as the HP 5065A, which take longer to get going. Mine has been running more or less continuously since 1978, and while other things have died along the way, it hasn't run out of tube life yet. Murray ZL1BPU _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
