[R-390] BFO multi-turn knob+ Bourns near equivalent

[Mark Huss]

You know, if you actually sat down and designed it from scratch, you 
could probibily get away with a lot less tubes than you think. Using 
mixers to derive a single frequency that is the sum of the three 
oscillators, Simple ring counters using decimal rather than binary 
logic, etc. Trying to get it into the case, though....
Bill Hawkins wrote:

>mikea said,
>
>"Sounds good. I think I could do that in between 30 and
>100 tubes. To do it all Glowbug-style, wecould use some
>of those fancy Burroughs decade-counter tubes."
>
>I still have some IBM 704 plug-in tube units, about 8"
>high by 10 wide by 1.5 deep, with eight 9 pin sockets
>and many terminal points. No sockets for the PIU, though.
>Some even have IBM brand tubes, almost all twin triodes.
>
>Don't have room for them in the 390, but it would be
>equipment from the same period.
>
>Bill Hawkins
>
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>


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