Richard Prosser wrote:
>
> I can remember taking apart a phillips TV turret tuner dating from the
> 60's. The higher frequency "biscuits" (pcbs which set the frequency and
> rotated with switch position) used printed pcb inductors.
> Richard P

Absolutely right. I think from the moment they switched from
using tagstrips (remember those?) to printed circuits some
clever boffing knew you could make a spiral inductor on
the PCB. I have seen these spiral pcb inductors on B/W
valve tv tuners, in TV that used tagstrips for all the other
circuitry, in other words the pcb inductors were some of
the FIRST circuit boards ever commercially made! Even before
it was cost effective to make the circuitry on pcb.
Good old US patents office.
-Roman

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