18 Nov
2010
18 Nov
'10
8:44 p.m.
Back in the 70's I worked as a Radio/TV repairman and it was a known
thing to add a boost transformer into old TV's to get more life out of
the CRT. iirc there were 10,15, 20% taps, cost was not much better
than crt replacement iirc.
But for an out of production crt was the only way. I did my parents TV
and it carried on like that for many years occasionally I put another
turn on as the emission dropped with time, and as it happened it was
left on 100% of the time while the rest of the TV was off.
Regeneration was to over run even more for a short period and also
play with the voltages to knock a layer of oxide off. You need one of
the regenerator tools for that though.
Dave Caroline
On Thu, Nov 18, 2010 at 8:35 PM, Jules Richardson
<jules.richardson99 at gmail.com> wrote:
Hi all,
I suspect some folk here have done this before.... :-)
My desktop CRT (over 10 years, but not what I'd consider vintage!) has been
ailing for some time, with the picture getting darker and darker despite
having the brightness at 100%. It's still good for high-contrast stuff such
as black text on white background, but forget trying to pull details out of
most photos, for instance.
Heater voltage seems good at 6.4VDC / 350mA (it's derived from the PSU in
this monitor rather than the flyback section), but I'm considering boosting
it a little and see if it improves things, obviously shortening the life of
the tube in the process.
Question is, what's a sensible amount to over-run things by? Say I aimed for
around 10%, is that too much and going to kill the heaters in next to no
time, or so little that unlikely to really make any useful difference?
cheers
Jules