Re: Mystery suitcase & unknown chassis
Apologies. This time with photos. Unknown chassis is the first pic. Car radio the last one.
Thanks for the explanation about the double diode Pentode CBL31 - I suppose this would be an economy measure to save a valve - sort of early integrated circuit!
An inverter for getting an AC supply would seem a likely suggestion for the mystery chassis. I will trace out what remains of the circuit when I get a chance.
Meantime here are pics of some of the chassis
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