That's an Emerson, and will have an Orion tube in it.
It is a 100% perfect drop-in for a Hantarex MTC900/e chassis. Perfect yoke compatability, though you will need to take off the yoke connector and use the one from the Hantarex.
Also, these tubes work excellently with Jen-Shinn low-impedence replacement chassis, again without the need to swap yokes. These have 10 pins, and about 14 ohm vertical yoke resistance.
They work pretty well with the Wei-Ya replacement chassis but are a bit more finicky with them but usually limited to just a bit softer focus or slight geometry issue on that chassis.
As far as drop-in for any more common chassis: No. You'd have to swap the yoke, and about 20% of the Emerson sets actually have bonded yokes, meaning you wont be able to remove it without breaking the tube. I have tried to drop one of these into a K4600 and couldn't converge it and noticed that the bell shape on the tube was not the same as a classic RCA tube, thus probably would not be ideal for that. Perhaps others have had better luck.
Please note: The existing yoke on this is LOW impedence, around 14 ohms. You will NOT be able to pop this with it's current TV yoke into a G07, K4900 or 20-EZ (45 to 55 ohms) or a K4600 (8 ohms). On the 4600 it will just have a very small picture and possibly ruin the deflection. On the others, it will definitely blow the vertical deflection circuit. You'd have to swap yokes for those.
Again, for the Hanterex or Jen-Shinn replacement chassis (and many times the WeiYa), these Orion tubes offer an amazing picture and look as good as a super nice Nintendo Sanyo EZ-20 and is as easy as dropping in and changing the yoke connector as the impedence is a dead-on match.
BTW--It's a 19" viewable tube. I've picked up over 20 of these in the last 7 years. While it may be calculated as 20" in the inner frame (e.g. be labeled with A51 vs. A48 tube number), it's only got 19" viewable. It's rare to find 20" viewable in 80's TV's. It was more common with square corner tubes in the later 90's. And yes, it WILL drop into any classic monitor metal frame. Any A48/A51 tubes do so. They have the same dog ear dimensions to mount. At least every one I've ever picked up.
So, IF it has a non-bonded yoke (80% should be this way), I should be able to swap the yokes without issue? How hard is it to swap a yoke?
