> my amp supply lk-500 zb did a funny thing a while back when I powered
> it up after a long time in the closet and a cross country move. so
> far I have found a blown 1 ohm, 5 watt wire wound resistor. it was in
> two pieces so there is little debate on whether or not it blew...
Most likely you have a gas problem with the tubes. That is normal
for tubes that sit a long time, especially tubes that might have had
the seals operated at elevated temperatures prior to sitting.
You can not test that with a VOM. You need a high voltage tester.
You should have a breakdown of 11kV or more from anode to grid
in a good 3-500Z.
The grid is the offset pin, and the two adjacent pins. The remaining two pins
are filament.
> one area that was suggested as a potential problem was an internal
> short in one or both tubes.
Yep, and it most likely is gas.
73, Tom W8JI
W8JI@contesting.com
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|