14 Aug
2014
14 Aug
'14
8:31 a.m.
Ok I think I see what's up. The FB primary isn't driven from line-derived
AC - it's driven by 125V DC, modulated by TS467, and I'm guessing at a
frequency equal to or some multiple of the horizontal scan frequency? Did I
get that right?
See and I always thought that the HV just provided a simple DC bias,
because that's the case in oscilloscopes - which are about the only 'video'
hardware I have any experience with.
On Wed, Aug 13, 2014 at 8:20 PM, Geoff Oltmans <oltmansg at gmail.com> wrote:
On Aug 13, 2014, at 7:13 PM, drlegendre . wrote:
Hmm.. but.. if both the HV (25K anode) & LV
(2.5V heater) secondaries
share
the same primary, then where is the HOT in the
circuit? There aren't many
xistors that will take 25K, so it's got to be on the low side, right?
The primary doesn't operate at 25kV....the anode secondary winding steps
it up to that voltage. The HOT operates at B+ which in this case is around
125V. It is TS467 in the schematic.