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
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