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Re: Topband: w7iuv preamp.

To: <Topband@contesting.com>
Subject: Re: Topband: w7iuv preamp.
From: "George Balint" <qrp.ben@sympatico.ca>
Reply-to: George Balint <qrp.ben@sympatico.ca>
Date: Sat, 17 Feb 2007 19:17:58 -0500
List-post: <mailto:topband@contesting.com>
Guys,

Here is an easy mail order source for 2N5109 and the suitable TO-39 heat sink:
heat sink: http://www.mouser.com/catalog/629/1607.pdf    $0.95 ea
transistor: http://www.mouser.com/catalog/629/377.pdf      $1.81 ea

Mouser's product finder / ordering: 
http://www.mouser.com/search/refine.aspx?Ntt=2n5109
There is no minimum order at Mouser Electronics.

Just get the right parts and build the PreAmp EXACTLY as described at Larry's 
web page and enjoy it.
There is no reason to "improve on it". Larry spent 20 years to arrive to the 
perfect stable design. He was kind enough to make it public free. It is already 
a pitty, that ON4UN's book published the circuit with an error added. Why do 
you want to put Larry into a situation, where he has to deal with a flood of 
email coming from confused hams, who has difficulty to tell which is the hot 
end of the soldering iron? If you decrease the current, performance will 
suffer. If you decrease the voltage, performance will suffer. If you substitute 
the transistor, you better come up with your own design and spend another 20 
years to prove, that it is working. If it ain't broken, don't fix it.

73, George
VE3NZ





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