19V2000 HV Level and Problem

On the subject of HV, I have a 19V2000 (P299?) in an AST DEL that
has 14KV for about two minutes and then it starts to drop to
7KV and stablizes. The effect is a screen that gets bigger and
bigger and bigger so that you can only see the 3" square center
of the screen. I've installed a cap kit, replaced the small TO92
drive transistors for the series BJT (not replaced though), and
replaced the two zeners in the error amp/regulator section. But the HV
still drops.
(NOTE: I've narrowed it down to the HV cage but testing in another cab with
known good
deflection board and CRT etc).

Do I need a new HV diode (suspect leaking?)? Connector issue (though
I have reflowed the connections)?

Any advice would be appreciated.

  SPW
  Kanata, Ontario
  CANADA

> -----Original Message-----
> From: Clay Cowgill [SMTP:ClayC@diamondmm.com]
> Sent: Friday, November 13, 1998 8:15 PM
> To: 'vectorlist@mcfeeley.cc.utexas.edu'
> Subject: RE: LV2000 demands
>
>
> > This brings up another question I was wondering about.. What do you
> > all
> > think about the HV voltage level..
> [...]
> > I bumped them all up to 19KV but there is no noticable difference
> > anyway, the picture stayed the same size between 16 and 19Kv. whaddya
> > think?
> >
> I usually run mine around ~15KV. Only reason is that it just *sounds*
> (literally) like it's less stressful. Pretty un-scientific, but seems
> reasonable.
>
> Seems to me that lower voltages would just have to be easier on the part
> and run a little cooler. Probably a little bit less likely to start
> internal arcing too...
>
> -Clay
>
>
Received on Sat Nov 14 13:17:30 1998