Hi,
Morris Odell escribió:
A great clock and appropriately flanked by Jim Willams' classic book and an
829B power tube!
And also some Tektronix Circuit Concepts books ;)
Have you taken any precautions against cathode poisoning in the nixes that
don't see a lot of change?
The nixies are
Sometimes trying to fix a faulty unit is simply a challenge.
Some more tips.
The LPRO with cover removed cannot work in the presence of artificial light
coming from AC powered sources!! It locks randomly to the light ripples.
My definition of the normal color of the rubidium light would be
Hi all,
My 5061A has failed and I've isolated the problem to a faulty A18, the +3500
volt ion pump power supply.
The existing one has almost certainly has had the internal 200M resistor go
open as the output voltage is about 5 kV and it does not decay quickly when
the power is off. The
Q703 voltages look good (with cover off and unit working). Lamp color seems
good (slightly pinkish violet). The room that I am in is lit by DC halogen
lamps so not rippley light to worry about.
I think I'll try soldering a wire to Q703 and try measuring it with the case
on...
Another thing
If you install the second unit, your 5061A still won't work. +20v at the
sensor output will signal the ion current monitor to shut down the
electron multiplier supply.
If you have some high-value resistors around, can you make up a test
200M resistor string? If so, see what happens when that's
Possibly, but from what I remember, the real issue is erosion of the EM
dynode surfaces from the high level of ion bombarment, resulting in
reduced output and lower S/N, and eventually such low multiplication
that the tube is considered 'failed'.
Bill Ezell
--
They said 'Windows or
