Chuck, How did you get to the bulb?
I thought the RVFR was a sealed assembly. Bill Hawkins -----Original Message----- From: Chuck Harris Sent: Saturday, March 20, 2010 7:52 AM The bulb on my HP5065A was silver gray in color when I had it out of the oven. It still had plenty of output to make the system work. -Chuck Harris Bill Hawkins wrote: > Corby, > > What I meant by "darkening" was that the photocell current and the > second harmonic were at half of their minimum value given in the manual. > I don't know what happens in the RVFR to cause that. > > Why would a clear bulb have a low output? Can you refer me to something > to read? I haven't found the right words to get Google to reveal any > useful links. > > Several years after I bought the 5065 in 2003, there was not enough > second harmonic to maintain control, saturating the integrator. So I > followed the cure for cell flooding given in the manual. After 10 days > the second harmonic stopped improving at about 10 on the meter. > > Something appears to be microphonic in the photocell. A sharp tap to > the case causes the second harmonic to peg the meter briefly. A Tracor > 308 does something similar, but it doesn't have a meter for anything > but error - the red Unlocked light comes on briefly. > > Perhaps my brain is darkening with age . . . > > Bill Hawkins _______________________________________________ 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.
