I sold the original Kloss radio in the late 60's, the walnut case and what we sales people called the "fried egg" dial was endearing. The sound, although not the Hi Fi rage, was as you state, non fatiguing, and very pleasant to listen to for hours on end. We sold a lot of them, along with the KLH speakers he designed as well. I have no doubt that you are enjoying it, especially if it sounds like the original. (In other words, forget the Bose wave).
Henry Kloss Model 1 Radio by Tivoli
For $100. via Audio Advisor this is a well built and excellent sounding radio. About 10"W, 5"H, and 6" deep it is easy to place, and with solid walnut (I think) sides, top, and bottom it is also easy to look at. The look is "retro" and is a modern version of H. Kloss' original Model 1. The sound character is mellow and non-fatiguing with amazing bass for a "little" radio. Simple to operate, it can be used anywhere there is a current bush. I have it next to my recliner, and am starting to use it instead of TV. It would work well in a garage, but I don't think I could bring myself to take mine out there. Highly Recommended. Note: I have NO connection with the Company or sales. Cheers. Craig.