Suggestions: 1) Was it working before? If not you may need to follow the cell-flooding correction procedure in the manual. Corby Dawson made an informative post about that phenomenon a couple of years ago, if you can find it in the archives.
2) If it was working but failed, check the +20V supply at J16 first. If the voltage at that jack is OK but no current is being drawn, the Colpitts oscillator that drives the lamp has failed. Nothing else will work until you open the RVFR and fix the oscillator -- which is possible but not much fun. Suggest checking the ESR of all of the capacitors on the A11 oven controller before you put it back into service. When I got my 5065A I had to replace a resistor on the oscillator board that had physically cracked from overheating. Both C23 and C24 on A11 were open; so were the same two 20 uF/50V capacitors on the battery-charger board. I don't immediately see how that could have caused the oven controller to run away, but it was pretty clear that it had happened at some point. Either way, if the lamp or cell oven current hasn't decreased within 20-30 minutes after turnon, you need to power it down and look for a controller problem. -- john, KE5FX > -----Original Message----- > From: [email protected] [mailto:[email protected]]on > Behalf Of J. L. Trantham > Sent: Tuesday, February 09, 2010 9:16 PM > To: [email protected] > Subject: [time-nuts] 5065A Problem > > > I have a 5065A that shows no PHOTO I or 2nd Harmonic. I am > suspicious that > the Rubidium tube is the problem. There is voltage to the tube and I > measure no current from the tube directly. All other indications seem > normal. Does anyone have any experience trying to rejuvenate the Rubidium > tube from a 5065A? > > Thanks, > > Joe > > > _______________________________________________ > 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. > _______________________________________________ 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.
