[pure-silver] Re: Off topic, Spot meter problem

  • From: Jean-David Beyer <jeandavid8@xxxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Tue, 20 Oct 2009 14:45:10 -0400

Tim Daneliuk wrote:

Dana H. Myers wrote:

Tim Daneliuk wrote:

 We had a saying at the Radar shop back in the
Bad Old Days, "If you can't fix it with WD-40, a hammer, and some
1N914s *** it can't be fixed."  I do not recommend hammers when tuning
a Pentax meter :)

*** A 1N914 is a type of diode very common in many kinds of radios
    and Radars.
Back when I was in the electronics biz, radars used various versions of the 1N21 for the mixer. This was true even when 1N914s were very cheap and widely used in digital circuitry. 1N914s were about $2 a piece when they first came out. Later, one semiconductor vendor gave them to us free if we bought all our transistors from them, which we did. 


Though 1N4148s seem to be more common these days.

;-)



You have to understand that I'm not that old, I just did this Radar thing
a long time ago (at the age of 5 :)  Back then the 1N914s ruled.

P.S. I am, however, old enough to have done lots of service work on
equipment employing "Vacuum FETs" (aka Pentodes) <smirk>
Actually, Lee DeForest tried to make a triode that really was an FET. The grid was a screen of wire OUTSIDE the glass envelope of a thermionic diode. While it worked, it made such a bad detector that plain diodes were used instead. He did patent it though and later, when AT&T thought to put the grid between the cathode and the plate, they ended up buying DeForest's patent for $1 million to avoid a nuisance in the courts. 

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