For a tube which has not been powered up for a long time it can take days or weeks for the ion pump to bring the vacuum back to a normal state.
Replacement tubes are available but they are breathtakingly expensive on the order of 22k It's a crapshoot with old Cs tubes but for $400 I'd be inclined to keep it and acquire over time the items needed to support it like HVPS etc Content by Scott Typos by Siri > On Feb 9, 2017, at 8:21 PM, David Smith <w...@msn.com> wrote: > > > Hello Time Nuts Friends, > > I have acquired an HP 5061A off of EBAY and I believe the cesium beam tube > may be bad. The ion pump meter pins out and never comes down to a reasonable > level. I don’t have an external HVPS to check the tube as suggested in the > manual. I’m thinking the worst here… that the tube is probably bad. The > seller listed it “For Parts” and the usual “I have no way of checking it.” > Fortunately, he has a 14 day return policy. He’s offered me $400 to keep it. > I have $725 in it. > > My question to the group is… are there replacement tubes available? Any > suggestions on what to do with it if I can’t get a replacement tube? > > Thanks in advance, > > Dave Smith / W6TE > Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
