boosting CRT heater voltage
ard at p850ug1.demon.co.uk
Fri Nov 19 15:27:35 CST 2010
> > A couple of things can cause this, but yes, most common is a weak picture
> > tube.
> The funny thing is, I've dealt with lots of CRTs and seen then die in various
> ways, but this is the first one I've ever had with the poor brightness issue -
> yet googling seems to suggest that it's pretty common. I must have been rather
> lucky... :-)
I've had several monitors suffer from poor brightness, but the CRT wasn't
the cause in any of them. The one I really remember is the Moniterm 19"
mono monitor used on PERQ T2s and T4s. Low brightness on that is al;most
always a problem with the HV power supply module.
> (One other observation is a simple eyeball test: the heaters *look* rather
> dark, with a dull orange glow. Again though it's hard to be sure without a
> direct comparison against something with an identical tube)
Wher dfid you measure the heater voltage? If not at the CRT pins, could
it be a bad connection somehwere between the CRT base and the PSU? Heck
could uit even be a bad connection between the CRT pins and the base
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