Heathkit/Zenith tubes

Heathkit/Zenith TubesI have 4, new in the box, CRT Tubes that may work with a Heathkit/Zenith H-19 or H-89 computer (I'm not sure how big the display on these models are. The tubes are 8 1/4 " x 6 1/4"). If they are for something else, and you know what that is, please let me know. I have been trying to find out exactly what these tubes are. I have pictures for additional identification. I would hate to get rid of them only to find out they are still useful for a repair or collector. Here are the part numbers and information: These numbers are on the tube: MN1012Pe1Av 254 and CPJ240A1V and 100-730-03E and HG-319 and C1406 380-2655 is written on the bottom of the boxes. The boxes are labeled Heathkit, but the tube inside is labeled Zenith. Thank you, Jeff Meyer