On Thu, Apr 26, 2018 at 07:03 am, Fabio Trevisan wrote:
there's a last problem which I won't be able to solve... the CRT is worn out
:-(
Have you tried boosting the filament voltage ? I have had good luck with that in TVs and now did a scope and it came out fine. It is just a matter of either jumping out a resistor or usually adding a turn to a winding on the HV transformer.
Anyway, back to the topic here. I am pretty adept at boosting CRTs so if you want details contact me, unless you don't want/need to.
Jeff Urban