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I have often wondered about the actual differences in Tektronix CRTs.
Within a basic class the tubes appear to be identical except for the part number.
Please cut me lots of slack on the word appear.
Just for example take the 465/a/b/m, 2213/3a/15/15a,and many others.
Quite some time ago, I got a nice 465B for almost nothing and it had a dead crt.
I had almost nothing to lose so I tried a jug from a 465M which had a badly
broken case.
It has been running fine for about four years now.
Any thoughts?

Aaaah.... empirical design. This always works.

A lot of Tek CRTs are different only in how the graticule is marked.

For example, if it weren't for the fact that the graticules are
different, I could swap the pristine, very low hours CRT from my OF150
optical TDR into my 492 if I needed to. Fortunately, the 492's CRT
is in excellent shape. And I COULD do the swap, but the OF150's
graticule is graduated to 8 divisions by 8 divisions and the 492's
graticule is graduated in a 10 by 10 division pattern, and the
reference markers are different. It would be either very confusing
or you'd have to totally change the calibration of the analyzer if you
were to use the OF150's tube...if you wanted to be able to rely on the
graticule for any information, that is.


Personally, I've always thought that the graticule should be an
overlay that's application specific and the CRT face is always clear,
so one tube type can be used in many products. But Tektronix tends
to go for the optimal solution for a given product rather than one
that's a little bit of a compromise. The integral graticule IS better.



--- In TekScopes@..., <bhaskins@...> wrote:

I have often wondered about the actual differences in Tektronix CRTs.
Within a basic class the tubes appear to be identical except for the

part number.

Please cut me lots of slack on the word appear.
Just for example take the 465/a/b/m, 2213/3a/15/15a,and many others.
Quite some time ago, I got a nice 465B for almost nothing and it had

a dead crt.

I had almost nothing to lose so I tried a jug from a 465M which had

a badly

broken case.
It has been running fine for about four years now.
Any thoughts?

Chris Johnson wrote:

Personally, I've always thought that the graticule should be an
overlay that's application specific and the CRT face is always clear,
so one tube type can be used in many products. But Tektronix tends
to go for the optimal solution for a given product rather than one
that's a little bit of a compromise. The integral graticule IS better.

If you go with an external graticule, the marking will be at least 1/4 inch
away from the phosphor. That leads to a rather nasty parallax problem.
Internal, or electronically drawn graticules are really the only way to go.

-Chuck