DIYbanter - View Single Post

[email protected]

wrote:

mc wrote:
"Jamie" t wrote in
message
...
h wrote:

As per subject. My other old CRTs go dim but all the trinitron
ones go
green. Is there a simple explanation?

green does the least work.

Hmmm...

Trinitron is a single-gun tube. I would expect it to go dim rather
than
having a color shift. If it goes green, maybe by losing the ability
to
deflect the electron beam from stripe to stripe?

1 gun in terms of G1,G2 but 3 separate cathodes that do indeed age at
different rates. I spotted a Sony PVM1354 at work today that is going
green and will need a new bottle shortly. Another common age symptom is
is highlight clipping of a single color, often red. It resembles a
'puddle' of the bad color. Only cure is to replace the tube.

GG

Trinitrons suffer a lot from falling emission, and are easy to repair.
Boost the heater voltage, starting with +33%, and if not good enough go
to +50%. This is a permanent heater voltage boost. On no account use
those awful crt rejuvenator machines on these.

On an experimental set, in which none of the channels were even visible
indoors in daytime I used +70% heater boost and IIRC +10% EHT boost and
it survived and worked like that for years. EHT boost is not
recommended unless you know the tubes x-ray limits, and are willing to
accept a slight chance of it dying.

NT