Swapped CRT and a ?

[jeyurkon]

Originally Posted by eberts

That is a straight gun with the focus hooked to G2 internally, remove the ion trap and leave it off.

Which CRT are you referring to? That doesn't seem to match the data sheet for any of the CRTs mentioned here, unless I missed one.

John

[Phil Nelson]

This reminds me of our discussion about the CRT and ion trap in my DuMont RA-103.

http://videokarma.org/showthread.php...light=ion+trap

Executive summary: The CRT looked like the type that doesn't need an ion trap, but it made no picture without it. With the ion trap in the sweet spot, it looks fantastic, so I'm keepin' it

Phil "whatever works" Nelson

[eberts]

Originally Posted by jeyurkon

Which CRT are you referring to? That doesn't seem to match the data sheet for any of the CRTs mentioned here, unless I missed one.

John

I am referring to the photo he provided.

Most data sheets on consumer CRT's used in the early 60's were never updated. The industry was moving so fast then, paper ended up in the incinerators.

[jr_tech]

Originally Posted by eberts

I am referring to the photo he provided.

Most data sheets on consumer CRT's used in the early 60's were never updated. The industry was moving so fast then, paper ended up in the incinerators.

So, are you saying that a CRT factory could have produced a 21XP4 with a straight gun even though such a beast can't be found in any tube manual?.... I still suspect that this tube was re-built, and a straight gun was installed at that time.

jr