Re: longitudinal waves

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

My appoligy I am only 30 years older. The High Z speakers were shaped like
old victrola trumpets and would fill a room with sound. The trumpet was made
of laquered paper. You can modify a modern large speaker by removing the
magnet and adding new pole former pieces to the magnet and re-mounting it.
You will nead real fine wire to wind right over the old voice coil, don't
try to remove the old.Add about 1/8" in thick coil and laquer it tight. The
outside pole-former will have to clear the new coil. This will work with no
power with a good antenna. Use an electric fence type lightning arrestor on
your antenna. I carried a scar for years across my belly caused when my
antenna was vaporised by a near miss.Many of the moderm speaker magnets are
mounted with heat glue and pop right off when heated and pried with a screw
driver.The outside pole former can be cut with a lathe and remounted in the
same place with heat glue.
   Robert  H 

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Wed, 06 Mar 2002 19:33:52 -0700
> To: tesla-at-pupman-dot-com
> Subject: RE: longitudinal waves
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Wed, 6 Mar 2002 19:55:33 -0700
> 
> Original poster: "David Thomson by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <dave-at-volantis-dot-org>
> 
> Hi Robert,
> 
>> Dave: I suspect I am just a bit older than you, 50+ years or so.
> 
> Thanks for the compliment, but you're not that much older than I.  40+
> 
>> I think I should let you know that modern speakers are low impedance and
> will not work on a crystal set.
> 
> I've built six crystal sets in the last 3 months, including the Mystery
> Crystal Radio from the 1930s.  I've got a good feeling for crystal radio
> output.
> 
>> You will nead to make your own high impedance speakers 2-20k as they are
> no longer made. Even high impedance ear phones are hard to get except
> surplus.
> 
> I'm a military surplus dealer.  I have all kinds of neat parts, including a
> box of military high impedance headsets.  If I need to, I'll add a battery
> in the detector circuit.  But I'm figuring that with an antenna of the size
> I'm working with, a high gain crystal set, and 1000 Ohm military radio
> headsets that I'll be able to pick up a signal without the batteries.
> 
>> You might try a crystal transducer or use an amplifier.
> 
> I've tried both, with success.  It's just for the thrill of using free power
> that I'm going to use the high impedance speakers.
> 
> I have an intense interest in many subjects and work on all these projects
> full time.  I appreciate the suggestions and welcome even more.
> 
> Dave
> 
> 
>