$$$ and coiling

From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent:  Thursday, May 28, 1998 2:41 PM
To:  Tesla List
Subject:  Re: $$$ and coiling

to: Homer & List

Be careful of "dead stock".  Sometimes a large vendor like Beldon will sell
some stock that doesn't meet full dielectric tests.  No problem running a
few hundred volts in a normal transformer design but on a Tesla secondary
where it is being stressed to perhaps 1,000 volts per turn or more you
might not want to have a wire that has tested weak and there really isn't
anyway to know until it starts breaking down on you.  This is one area
where you should not skip corners -- use a 200 hundred degree C. magnet
wire such as Beldon Polythermalize -- TC's can present some tough
engineering problems without using substandard components and then watching
all your hard work go up in smoke -- not to mention the frustration.  The
200 C. wire doesn't really cost very much $40-$50 for a typical coil and
provides excellent RF resistance to creepage and capacitive coupling of
energy through the dielectric which are two problems you don't run into
with a standard magnet wire as used in solenoids, small xmfrs, etc.
This is one area where cutting costs can provide big headaches later.  Been
there -- done that -- and cried!!!


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: $$$ and coiling
> Date: Wednesday, May 27, 1998 10:14 PM
> ----------
> From:  Homer Lea [SMTP:HomerLea-at-aol-dot-com]
> Sent:  Wednesday, May 27, 1998 9:40 AM
> To:  tesla-at-pupman-dot-com
> Subject:  Re: $$$ and coiling
> In a message dated 5/26/98 11:54:56 PM Pacific Daylight Time,
> writes:
> > >what's the cheapest any1 can find AWG24 for a secondary.
> >  
> I have been buying wire from  <A
> - America's Leading Electronic and Electr...</A>  at good prices. They
have a
> minimum order of $100. Call the one nearest you and ask about dead stock.
> got a bunch of rolls 17ga to 28ga magnet wire $2.08 to 2.80/lb.
> jim heagy