On Fri, 21 Aug 2009 09:31:31 -0500, John Fields
wrote:

On Fri, 21 Aug 2009 07:07:59 -0700, John Larkin
wrote:

On Fri, 21 Aug 2009 06:30:28 -0500, John Fields
wrote:

On Thu, 20 Aug 2009 22:07:46 -0500, "Martin H. Eastburn"
wrote:

First, Si diodes were not used in WW II. The PN SI diode wasn't invented yet.

Selenium wafers and sticks were the power types
and point or whisker diodes for RF. [ I have some of these in lead cans ]

In the 60's it was still that way.

Silicon diodes were developed by bell labs for internal telephone use
but semiconductor had to be invented first.

Look at the date of the transistor. Silicon diode and Germanium diode.

I know Radar in B52's were using Selenium and Germanium for RF.

http://www.computerhistory.org/semic...ine.html#1940s
Different times scan down the page...

Silicon came later since it was hard to use and Ge was the center of
it all.

---
From the post you're responding to's headers:

"Date: Sat, 12 Apr 2008 17:51:10 +0200"


Three questions:

1. Why are you responding to a post that's over a year old?

Because it just appeared in s.e.b.

2. Why are you top-posting?

Donno. Emails are by convention top, usenet is bottom. I do a lot of
emails, twenty or so yesterday, and sometimes I forget.

3. Why don't you do a little fact-checking before you post?

What facts do you dispute? Wanna argue with my RadLab books, or my
1964 Allied catalog, or my shelves of radio books going back to 1918?

OK, let's go: when was the first junction transistor made? By whom?

---
Morgan Sparks, of course, but why are you getting in my face when my
post was to Mr. Eastburn, not to you?

JF

Because I hadn't had coffee yet, and because I've got used to you
harassing me.

John