A Diode Blast from the Past

[Phil]

Hi Frank

You’re obviously more observant than me. Funny, because I got the distinct impression from the style that the oldest document was first. I loved the “no heater supply required!” emphasis and I would dearly love some 1N35 matched pairs and the matched quads for balanced mixers and modulators. Of course, I could match some of my own and put them on a PCB nowadays.

I remember adverts in the 1970s for crystal sets using “super-sensitive crystal diodes made especially for wartime radar!” as an advertisment for some kids radios made from WW2 surplus.

Phil M1GWZ



> On 22 Apr 2017, at 18:30, fgentges at mindspring.com wrote:
> 
> Phil,
> 
> I was similarly curious.  I looked and found 11-47 at the bottom of the first document.  Nothing for the second document but then 10-46 for the third.
> 
> This would indicate November 1947 and October 1946.  These are pretty early documents.  I like the amateur radio one with circuits including the SWR bridge for open wire line.
> 
> Frank K0BRA