I don’t have any suggestions for you, I was just wondering if you’d post a picture of your Litton? :)

you can get a GE .7 cu ft microwave WITH a turntable. This is a small countertop microwave and the turntable makes it a better unit. So if you can get SMALL WITH turntable, why wouldn't you?

herb: Because I don't like turntables. Rectangular serving plates don't turn. Turntables are one more thing to wash. You have to keep them on their tracks. I don't like turntables. Never needed one and don't want one now.

Sammy: It's a beauty isn't it. Bought in 1981 or 1982 and hasn't disappointed me yet. Fantastic machine.

Forgot to mention that I also still have a 1980 GE Americana range similar to this image from Google but in Harvest Gold. The top oven is a conventional oven - not a microwave. Hence the Litton. The exhaust is vented to the outside. This was very ahead of its time for an all-in-one appliance.

Turntables are more common nowadays than wave stirrers, unfortunately. You can typically remove the turntable to handle dishes that won't fit on it but then there's the impact of uneven heating unless you pause and manually rotate the dish.

You're looking for a "flatbed microwave"

https://www.which.co.uk/news/2017/02/which-tests-reveal-the-best-flatbed-microwaves/

I don't know if they're available in the USA, though. (The link above is from the United Kingdom.)

In the US, you usually find turntables in regular microwaves and you occasionally find flat beds in speed ovens (e.g. Miele). Unfortunately, speed ovens are much more expensive and usually require 220V. So, you won't find a lot of countertop options. And if you do find them, they usually don't have the best reviews -- also, the only countertop models that I am aware of still have a turntable. So, this wouldn't really help anyway.

In other words, I don't know of any current US microwave that meets @fuzzy wuzzy's criteria.

The newer style MW drawers don't have turntables. I've always had MWs with turntables, so still getting used to the new one without.

Be careful with drawers though. Sounds as if they all eventually catch fire: https://www.houzz.com/discussions/problems-with-sharp-drawer-microwave-dsvw-vd~3142409

"don't like carousels. Wastes space"

I have a basic Sharp countertop MW. The carousel in mine is just a platter that turns. I don't think it takes up 1/2" in height, and it's diameter goes to the very edges of the MW's interior. As long as you don't get a convection MW, the interior should be very roomy with the carousel. Have you seen MWs in the store and looked at how roomy they are with the carousel? Also, the turning carousel serves a purpose in that your food will be more evenly heated if it's turned slowly while microwaving. My advice is to look at the MWs with carousels in a store before you dismiss them as not being spacious enough.

With MW without a carousel, the waves are spread evenly over the interior of the MW so there is no need for the food to rotate.

That's quite possibly the issue that Sharp is having with their drawer microwaves catching fire. Microwaves have a wavelength on the order of 4"-5". This means, if you simply flood the interior of the oven with microwaves, you'll inevitably get hot and cold spots where the reflected waves interfere with each other.

Rotating the food through these spots is one possible solution. Another option is to rotate the emitter and/or the waveguide. That's what flatbed and drawer microwaves have to do. But it's more complicated to build. And several people have reported that they heard scratching sounds before their Sharp microwave died. It is possible that the rotating mechanism failed, and that ultimately resulted in the magnetron overloading and catching fire.

Thank you to Sophie and Maecom for providing an answer.