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[AMPS] Home Brew Tubes

To: <amps@contesting.com>
Subject: [AMPS] Home Brew Tubes
From: k7fm@teleport.com (Colin Lamb)
Date: Thu, 5 Jul 2001 14:13:12 -0700
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As long as you are going to build your own tubes, there are a couple of =
modifications that might make sense. =20

1.  Instead of using electricity to operate the filament, try propane.  =
Use an external heat source and a good heat conductor to emit the =
electrons inside the tube.  Charcoal would work, but qso's would be =
short.  The advantages are that you would not need to worry about =
bypassing the filament leads and if you need more power, just turn up =
the heat. =20

2.  Make the plates with a special Measures material that will reduce =
parasitics without the need for external suppressors. =20

3.  For the ultimate in efficiency and harmonic reduction, build the =
vacuum input capacitor into the final tube.  No more long leads. =20

If you can make the tube out of material that would otherwise be thrown =
away, you get extra bonus points.  Old tin cans for the plate are good.  =
Even better are old beer bottles for the home brew 807.  Instead of the =
tube getting brown with age, perhaps it will get lighter

With a forge arrangement, even wood from the back yard can be used to =
create free electrons.  Firing up the linear will no longer be a figure =
of speech. =20

73,  Colin  K7FM
 =20

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<DIV><FONT face=3DArial size=3D2>As long as&nbsp;you are going to build =
your own=20
tubes, there are a couple of modifications that might make sense.&nbsp;=20
</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>1.&nbsp; Instead of using electricity=20
to&nbsp;operate the filament, try propane.&nbsp; Use an external heat =
source and=20
a good heat conductor to emit the electrons inside the tube.&nbsp; =
Charcoal=20
would work, but qso's would be short.&nbsp; The advantages are that you =
would=20
not need to worry about bypassing the filament leads and if you need =
more power,=20
just turn up the heat.&nbsp; </FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>2.&nbsp; Make the plates with a special =
Measures=20
material that will reduce parasitics without the need for external=20
suppressors.&nbsp; </FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>3.&nbsp; For the ultimate in efficiency =
and=20
harmonic reduction, build the vacuum input capacitor into the final =
tube.&nbsp;=20
No more long leads.&nbsp; </FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>If you can make the tube out of =
material that would=20
otherwise be thrown away, you get extra bonus points.&nbsp; Old tin cans =
for the=20
plate are good.&nbsp; Even better are old beer bottles for the home brew =

807.&nbsp; Instead of the tube getting brown with age, perhaps it will =
get=20
lighter</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>With a forge arrangement, even wood =
from the back=20
yard can be used to create free electrons.&nbsp; Firing up the linear =
will no=20
longer be a figure of speech.&nbsp; </FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>73,&nbsp; Colin&nbsp; K7FM</FONT></DIV>
<DIV>&nbsp;<SPAN =
id=3D__#Ath#SignaturePos__></SPAN>&nbsp;</DIV></BODY></HTML>

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