In article ,
Bruce Esquibel wrote:
"Dave Plowman (News)" wrote:

With many CRT sets - IMHO most noticeable with Trinitron tubes - the
red gun ages more than the others due to being driven harder than the
others. Resulting in the tint you describe.

Hmm, maybe my memory is going with old age but...

1) The main point with the Trinitron tube was it only had one gun, thus
providing a better/different picture because there were fewer color
alignment problems. It used that special shadow mask and was the first
crt to use rectangle shaped color landings instead of the standard round
hole delta pattern everyone else used.

If it only had one gun there'd be only one colour. But if you prefer it's
one gun with three barrels. ;-)

2) The blue gun (in non-trinitron tubes) was the one always pushed the
hardest because it's the color the human eye in most people was the
least sensitive to, so it needed the highest gain.

That matters not - it's the efficiency of the phosphors which determines
the drive needed and red is the least sensitive.

And I'm sure on #2, I remember the shorting alligator clips used on some
of the color generators that went into the grids of R/G connections on
the picture tube. You would kill off the red/green and bring up the blue
just below the point of blooming, then bring up the red/green to match
and set the gray scale.

Different makers use different methods. Early Sony sets had an external
green gain control to make compensating for tune aging easier.

Unless Sony came out with a 3 gun Trinitron towards the end (after I got
out of the tv repair biz), all Trinitrons only had a single gun.

-bruce


If anything, red was the minimum of the three.

Not so, IMHO.

--
*If vegetable oil comes from vegetables, where does baby oil come from? *

Dave Plowman London SW
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