An associate of the museum brought it a unique CRT. This is obviously a hardcopy CRT and similar to the DVST hard copy CRT used in the 4631 as seen in these photos.

but we are not exactly sure how it was used. The faceplate has different color filters. In this front view you can see the mounting posts on the bottom side of the CRT.

It is large, long, and heavy with a ceramic body.

The top side has several labels and informational text.

It was made and sold by Thomas Electronics.

This writing indicates a date of December 22, 2000.

The bottom side has three massive mounting posts.

The gun assembly doesn't show a lot of detail. There are no neck pins.

The ceramic body has all the earmarks of being manufactured by Tektronix. The ceramics operation was spun off in 1994 from Tektronix as Vispro Corporation, a supplier of LTCC multi-layer ceramic substrates and structural ceramic components.  In January of 2000  Kyocera America, Inc. acquired VisPro Corporation. Their press release states "Effective January 12, 2000, VisPro has become a new division of Kyocera America, Inc. The new division's 60 employees will continue to operate out of their Beaverton, Oregon facility."

This reinforces our assessment that this funnel was manufactured by the former Tektronix ceramic operation in building 13.