17 Oct
2018
17 Oct
'18
7:49 a.m.
On Wed, Oct 17, 2018 at 9:33 AM Josh Dersch via cctalk
<cctalk at classiccmp.org> wrote:
And I was wrong -- the flyback's fine (yay!).
Found a nearby 0.015uF, 400V
film capacitor that was shorted. Replaced it and now I have video! It's a
bit dim, it's too wide, and gets wider as it warms up but it's a start :).
That suggests to me that what we call the 'EHT' over here -- the 12kV-15kV
on the final anode of the CRT -- is low and is sagging under load. Low EHT
will cause a dim picture, it will also cause the electron beam to be
less 'stiff'
(as the electrons are not moving as fast) so the deflection coils have a greater
effect and the picture is larger.
Possibly more capacitor trouble in the flyback area.
-tony