Trying to figure out what CRT this is

[Polaraligned]

Thanks for your thoughtful response James.

I would like to figure out what CRT this is regardless of the set it is potentially going into, as it may be useful in the future for a different set. The Sams is wrong, and Bob Anderson is right. The Admiral is a 10BP4. Funny thing is that I knew it was a 10BP4 when I got the set a few years ago, but I only just looked at the Sams the other day and said "wow, I need a 12" CRT for that set". Another Sams mistake, but I knew better.

Anyway, I would like to know what commercial CRT this matches best so I can save it for a future set, or pass it on to another fellow in need.

I pulled the CRT yesterday and it looks like a rebuild. The weld around the neck looks terrible, almost like it is a perfectly circular crack around the whole thing. But the CRT puts out a nice bright raster.





The screen is not aluminized.

The TV it was working in does not have an electromagnetic focusing coil.

There is not a chassis number, or any numbers anywhere to indicate what the CRT is.

Maybe it is just a mutt, with the dimensions of one tube and the gun of another.

Might I guess that putting an electrostatically focused CRT into a magnetically focused set is just a matter of disconnecting the focus coil and supplying the proper focus voltage on the focus anode? or does it get more complicated than that?

Thank you.
Scott

[Kevin Kuehn]

FYI Sams 100-1 covers 3 chassis variations, of which the 20X1(model 20X122) uses the 10BP4. Both the 20Y1 and 20Z1 use the 12LP4. I think the 20X1 also has the front controls laid out similar to the older 20A1, but electrically all three chassis type are nearly identical.

[Electronic M]

Originally Posted by Polaraligned

Might I guess that putting an electrostatically focused CRT into a magnetically focused set is just a matter of disconnecting the focus coil and supplying the proper focus voltage on the focus anode? or does it get more complicated than that?

Thank you.
Scott

Better to leave the focus coil wired in (it'd be a pain to duplicate it's electrical characteristics in some sets), but move it so the CRT no longer sticks through it.