"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.

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.

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.

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.