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8SN7 experiences
This is pretty much off-topic, but I can't resist. When I was in the
4th grade in Concord, California, I'd been building crystal sets for a couple of years and playing around with "space ship" AM radios that you got by sending in $3.50 and a couple of cereal boxtops, but I really wanted a better receiver. We had a copy of an encyclopedia called "The Book of Knowledge" in the classroom, and I read and re- read the article about shortwave radio until the pages just about fell out. They told you how to build a one-tube receiver using a 6SN7. You wound your own coils, and the B+ supply was a 90-volt battery. If I remember correctly, the 6SN7 was a dual tetrode(?), and the receiver used half of the tube as a mixer and the other half as an audio amp. I built one by going down to the local TV repair shop and bugging them for parts, and I actually got it to work, after a fashion. Then I moped around for the next couple of years, trying to figure out how I was going to learn more about radio, until I changed schools when I went into the 7th grade. Miracle of miracles: my 7th grade teacher was a ham radio operator!! Within about 3 months I had my Novice license. And the rest, as they say, is history! Oh, God, I shouldn't have told you I'm a ham. Now you're going to think I'm weird. |
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