I put a picture on the "How many miles in the month thread"
which may be of interest to consumers of this thread. It is a "clothes on picture" but I thought their may be some titivation in revealing a little more here...
Philips were absolute wizards with tuned circuits, they could get the performance out of three valves the other manufacturers need five for. Same with transistor circuits, one of their first transistor car radios used only four transistors.
The Philips a pre war set similar to the picture called the 'Mono Knob' it only had two controls, an inner knob that operated like a joy stick - long before they were invented, moved round for tuning and up, down and sideways for volume, tone etc, and a ring round the outside for wave change. All operated by Bowden cables, a night mare to repair if one broke.
The tone control section actually altered the band width of the IF's with a variable inductor. Amazing set!