How about a temporary departure from the usual subject of test equipment, so we can go and listen to some music?
Here's an Aiwa R22 radio from roughly 1980. It is shown in this photo with the matching A22 integrated amplifier and a nice Keesonic speaker. I also have the matching L22 cassette deck, but that's hidden away in the cupboard as it doesn't work.
It has FM and MW. Sound quality is very good and it is pretty selective. The radio is based around the Hitachi HA11211 IC, which is basically a radio-in-a-chip, but there are tons of passives surrounding it. Tuning is accomplished by an air spaced variable capacitor which is coupled to a multi turn knob by some gears and bits of string.
This photo shows the back of the front panel board which contains the LED displays. As far as I can tell, the big circular thing is just some kind of flywheel on the tuning knob. Also a couple of bodge components.
Here's the front panel. The Toshiba T1400-E chip is some kind of frequency counter. The LED display just shows the measured frequency.
The bar graph display is driven by another IC hidden under the black painted metal thing.
The electronics in this has a slight bodginess in the construction, but overall is generally well built and works fantastically.