I cleaned the anode cap and the tube where it attaches. I experimented
a little more and found that the sparking happens when the horizontal
half of the yolk is connected, but using the horizontal section from
another yolk, I get a dot in the middle of the screen, so the tube
works at least a bit. Can I assume that if i get a dot, then the tube
is fine or could there still be a problem with the tube?

could a problem in the ABL circuit cause these results? I suspect
there may be one because I found some blown resistors.

wrote:
Ancient_Hacker wrote:
wrote:

I am working on a Toshiba 32hf72 chassis N2PS. Found a bad flyback and
replaced it. Now there is a problem with the HV sparking. At first it
sparked around the anode connector. I cleaned that with no effect. I
have found a couple things that don't make sense to me:

Connected the HV to another tube and connecting the dag together with
no other connections yield proper start up with no sparking.
Connecting the tv together normally, but using a different yoke that is
not on the tube makes the tv start up, but it sound wrong. there is a
sound like sizzling inside the tube. Hard to describe. if the yoke on
the tube is connected instead of the other yoke, I get sparking again.
ANY ideas?

Bad CRT? Air in CRT?

I dont know what specifically you cleaned, but I know that any arcing
converts anything present to carbon, and any cleanup has to be very
thorough indeed to work.

If youve replaced the EHT wire/rubber cap and cleaned everything
immaculately, the only remaining culprit would be the CRT, if thats
where the sound is coming from. Dont think I've encountered a tube
doing that before, but if it is, it is.


NT