"David C. Partridge" wrote in
:

In this case no problem - filament is driven straight if the mains
transformer.

Good,as long as the xfmr insulation holds up. It has to be insulated for
more than 2-3 KV cathode voltage.
TEK departed from that after experience with the old 500-series tube-type
scopes.


HT now spot on, and don't think EHT too high - it's only a quintupler,
and if HT is right, don't see EHT can be too high - or am I being
naive?

No,that is not critical.
TEK used a 3 or 4 percent tolerance on it's scopes HV supplies,IIRC.

--
Jim Yanik
jyanik
at
kua.net



David
"Jim Yanik" . wrote in message
.. .
Which also may mean that the CRT filament voltage is higher and thus
shortening the CRT's life.(if the fil V is derived from the HV power
supply)
TEK discovered that 0.1v higher fil voltage drastically shortened
their model 2213/15 CRT lifetime.

--
Jim Yanik
jyanik
at
kua.net