Do these tone controls count as two or four knobs? :scratch2: ...
I think I would count those dual tone controls, as two knobs each, or as stacked knobs. I assume they give you separate tone adjustment on each channel, no? Although, all along, I have been open to others refining how different things might be counted.
Then, too, the whole question of why more buttons came in and what this idea of a ratio between knobs and buttons might mean is also open. Maybe what people engaging in this conversation get out of it, by considering these elements of receiver (or other component) design and function has little to do with the "vintageness" idea I first asked about.
I get the impression some responders never considered how many of different kinds of controls a favorite receiver of theirs had, and it's kind of fun to pay attention to that, and post pictures, and wonder why those controls and their layout matters to them.
I, personally, am still am interested in the vintageness issue. I especially like my '71 Kenwood KR-5150. I just got a pair of KLH Model 24 speakers, circa 1968. They sound so much better connected to the 5150 than they did connected to the circa 2015 system the fellow I bought them from let me hear them on. The 5150 only has a few more knobs than it has buttons, and not nearly as many controls total as some of the machines people have posted about, but it has enough. I've had some much more recent receivers, circa early 2000s, and they really didn't impress me, despite their inflated wattage specs and other bells and whistles. And I do like the look of older equipment more.
I recall that with probably the best of those more recent receivers I had, one of its knobs could have very different functions, depending on what button had just been pushed. And some the buttons, also, scrolled through levels of choices. If you forgot what level of what feature you had to go to in order to change a certain adjustment it was very frustrating -- AND NOT AT ALL intuitive. That receiver did not offer what I would call simple and direct control.