Subject: glowbugs V1 #203
glowbugs Wednesday, December 10 1997 Volume 01 : Number 203
Date: Mon, 08 Dec 1997 11:30:17 +0000
From: BOB DUCKWORTH <bob@atl.org>
Subject: server back up
technical difficulty at remote site resolved.
i was in dallas for three days and had no way to fix until
this am
- -bob
wb4mnf
Date: Tue, 09 Dec 1997 11:42:39 -0600
From: Conard Murray <cfm5723@tntech.edu>
Subject: We're back!
Hi Gang,
Looks like the list is back functional! Thanks to who ever fixed the
problem!
73 and ZUT!
Conard, WS4S
your friendly listowner
Date: Sun, 07 Dec 1997 17:53:21 EST
From: ne1s@juno.com (Larry Szendrei)
Subject: "pencil" tubes
Season's Greetings, fellow thermionic emission enthusiasts,
Last Tuesday nite at the local ham radio club meeting I was given some
"pencil" tubes and challenged to "build something" with them. Problem is,
I have no specs or pinouts for these things. Can anybody help? All were
made by Raytheon, and this is what I've got:
JRP5672 (Glass envelope)
JRP1AD4 (Metal Envelope)
JRP5678 (Metal Envelope)
Since this is a "contest" of sorts, I'd like to show up at the next
meeting with, in the very least, a functional low-power xtal oscillator
made with one or more of the above. Any assistance will be much
appreciated.
Thanks,
Larry (NE1S)
Date: Tue, 9 Dec 1997 12:48:23 -0600
From: w5hvv@aeneas.net (Roderick M. Fitz-Randolph)
Subject: Parasitic Suppressor
I am in the process of building a VT-4-C (211) Hartley Oscillator
transmitter and have only a few 2 watt composition resistors with
which to build a parasitic suppressor for the plate. They are:
1 ea. 10 ohm 2 watt composition
2 ea. 15 ohm 2 watt composition
1 ea. 100 ohm 2 watt composition
1 ea. 150 ohm 2 watt composition
Since I don't have the foggiest idea where I can get any others,
I am asking those of you that are knowledgeable about such things,
which of these might make the best resistor around which to wind
a coil for parasitic suppression on an 80 meter Hartley?
Also, would like to insert, close to the grid pin on the socket,
another resistor to act as a parasitic suppressor. Which of those
I have available would accomplish this?
My purpose is to make a vintage 211 Hartley Oscillator transmitter
on an oak bread board and make it as close to the original open
breadboard design as I can and yet still have something that won't
tear up everyone's TV set.
Any help will be appreciated.
Rod, N5HV
w5hvv@aeneas.net
Date: Tue, 9 Dec 1997 13:16:11 -0600
From: "Freeberg, Scott (STP)" <scott.freeberg@guidant.com>
Subject: Test Msg, DO NOT READ
This is a test message. Don't send me any flame email,. I am trying to
get rid of this dratted attachment problem and I
need to send through the listserver to find out if I am successful.
Scott WA9WFA
Attachment Converted: "c:\eudora32\Attach\winmail23.dat"
Date: Tue, 9 Dec 1997 11:58:05 -0800 (PST)
From: Ken Gordon <keng@uidaho.edu>
Subject: Re: Hello 1 2 3 4 5
> Test ....
> Conard
Got it.
Ken
Date: Tue, 9 Dec 1997 11:59:08 -0800 (PST)
From: Ken Gordon <keng@uidaho.edu>
Subject: Re: We're back!
> Hi Gang,
> Looks like the list is back functional! Thanks to who ever fixed the
> problem!
> 73 and ZUT!
> Conard, WS4S
> your friendly listowner
Great! I will go ahead and configure Piobaire for the GB list, but won't
activate it. Usually if you HAVE a backup, you never need it...
Ken
Date: Tue, 9 Dec 1997 16:39:58 -0500 (EST)
From: rdkeys@csemail.cropsci.ncsu.edu
Subject: Re: Parasitic Suppressor
>
> I am in the process of building a VT-4-C (211) Hartley Oscillator
> transmitter and have only a few 2 watt composition resistors with
> which to build a parasitic suppressor for the plate. They are:
>
> 1 ea. 10 ohm 2 watt composition
> 2 ea. 15 ohm 2 watt composition
> 1 ea. 100 ohm 2 watt composition
> 1 ea. 150 ohm 2 watt composition
>
> Since I don't have the foggiest idea where I can get any others,
> I am asking those of you that are knowledgeable about such things,
> which of these might make the best resistor around which to wind
> a coil for parasitic suppression on an 80 meter Hartley?
Actually, any of those values should work. I have always thought
that just a few ohms was usually needed, hence would probably use
the 10 or 15 ohm resistors, as ones of choice.
> Also, would like to insert, close to the grid pin on the socket,
> another resistor to act as a parasitic suppressor. Which of those
> I have available would accomplish this?
Only one parasitic suppressor is needed. Use it in the grid, with
the two watt resistor and you should be able to make it work, just
fine. On some of the old diagrams you will find a point marked ``X''
in the grid lead (as close to the tube as possible) where it usually
went. If you were running a tptg or had paralleled or pp tubes, it
might be advantageous to run two suppressors.
> My purpose is to make a vintage 211 Hartley Oscillator transmitter
> on an oak bread board and make it as close to the original open
> breadboard design as I can and yet still have something that won't
> tear up everyone's TV set.
TVI is not usually a problem, because of the hi-C designs. But,
fundamental overload can be a problem, in weak areas. The parasitic
suppressor should handle any odd LC squirrelies. More importantly
is probably the concept of using sufficient tuning to lopass or passband
the antenna output. I prefer a series LC which is resonant at the band
of choice, into a standard low-impedance load (coax, end fed 1/4 wave,
open-line-fed antenna, etc.). A coax line to a standard pinet tuner
will work fine, too (as will a breadboard pinet on a separate board on
a longer mounting board). I have one tv set that is just above the
Hartley that will get some tvi off the line but not the coax (cable
fed tv). Some judicious use of old ferrite cores helps there.
> Any help will be appreciated.
>
> Rod, N5HV
> w5hvv@aeneas.net
Sounds like you are getting there, rather well!
Bob/NA4G
Date: Tue, 9 Dec 1997 16:48:38 -0500 (EST)
From: rdkeys@csemail.cropsci.ncsu.edu
Subject: Re: "pencil" tubes
>
> Season's Greetings, fellow thermionic emission enthusiasts,
>
> Last Tuesday nite at the local ham radio club meeting I was given some
> "pencil" tubes and challenged to "build something" with them. Problem is,
> I have no specs or pinouts for these things. Can anybody help? All were
> made by Raytheon, and this is what I've got:
>
> JRP5672 (Glass envelope)
Dunno..... that is a 5672 tube.
> JRP1AD4 (Metal Envelope)
The 1AD4 is the standard pentode used in the old Motorola Dispatcher
FM sets (last of the really funky looking art-deco all-set-to-take-off
50's toys). It should work fine as a normal pentode oscillator or amp
or regen detector even. The metal envelope is a graphite coating of some
sort, if memory serves me correctly, as a shield. Look in any of the
old Motorola Dispatcher or portable fm manuals from about 1958 to 1960
or such for more info.
> JRP5678 (Metal Envelope)
Dunno...... that is a 5678 tube.
>
> Since this is a "contest" of sorts, I'd like to show up at the next
> meeting with, in the very least, a functional low-power xtal oscillator
> made with one or more of the above. Any assistance will be much
> appreciated.
Hey, use it as an ECO for a micromini tube set for 160 or 80 meters.
Drop it in place of anywhere a 6L6 or 6F6 would be used and build
it on a tin Sucrets box. Years ago, there was a 1 tube/1 xstor
regennie called the ``wee-ciever'' in 73 or CQ built like that.
If it is round, and not flat, it might be a dualtriode, and could
be used as detector and audio in a micromini regennie.
> Thanks,
> Larry (NE1S)
Good Luck, and keep us posted on how it works out, and whatever it
becomes.....(:+}}....
Bob/NA4G
Date: Tue, 09 Dec 1997 15:10:57 -0600
From: Conard Murray <cfm5723@tntech.edu>
Subject: test for scott "straight"
This is supposed straight text.
Conard
Date: Tue, 09 Dec 1997 15:13:44 -0600
From: Conard Murray <cfm5723@tntech.edu>
Subject: test for scott "HTML"
This is a multi-part message in MIME format.
- ------=_NextPart_000_005C_01BD04B5.0A36D800
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
This should be in HTML and all sorts of colors.
Conard
- ------=_NextPart_000_005C_01BD04B5.0A36D800
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<HTML>
<HEAD>
<META content=3D'"MSHTML 4.71.1712.3"' name=3DGENERATOR>
</HEAD>
<BODY>
<DIV>This <FONT color=3D#ff0000>should <FONT color=3D#00ff00>be in <FONT color=3D#ff00ff>HTML <FONT color=3D#00ffff>and =
all <FONT color=3D#008080>sorts <FONT color=3D#800080>of =
colors.</FONT></FONT></FONT></FONT></FONT></FONT></FONT><=
/FONT></FONT></DIV>
<DIV><FONT color=3D#ff0000><FONT color=3D#00ff00><FONT color=3D#00ffff><FONT color=3D#c0c0c0>Conard</FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV></BODY></HTML>
- ------=_NextPart_000_005C_01BD04B5.0A36D800--
Date: Tue, 9 Dec 1997 17:05:12 -0800 (PST)
From: Ken Gordon <keng@uidaho.edu>
Subject: Regennies, etc..
1) Does anyone have schematics of their OWN regennies which they might
mail to me for an SASE? Hand drawn is fine.
2) Bob Keys mentioned "...glass plate capacitors..." in one of his posts
on Hartleys. How does one figure the capacitance, etc? Or do you just make
some out of, say, 3" square glass plates and tin-foil, and measure them
later?
Ken W7EKB
Date: Tue, 9 Dec 1997 20:56:50 -0500 (EST)
From: lee1@digital.net (Leon Wiltsey)
Subject: Re: new address
>>
>>Hi gang.
Finally got my email address problem fixed.
Anybody wishing to contact me use lee1@digital .net.
used to be leeboo@ct.net
>>
>>
Thank the good LORD for all that you have!!!
67yr old semi disabled senior trying to get code speed to 13wpm
(stroke got my eyesight, balance & coordination) SO ONLY BA'S NO SOLID STATE
Leon (lee) Wiltsey 4600 Lake Haven blvd Sebring fl. 33872 KF4RCL TECK+
Date: Tue, 9 Dec 1997 21:07:01 EST
From: EWoodman <EWoodman@aol.com>
Subject: Are We Back??
Just saw Conard's test message. Are we up and running again??
Erid
Date: Wed, 10 Dec 1997 10:45:20 +0100
From: Jan Axing <janax@algonet.se>
Subject: Re: Regennies, etc..
Ken Gordon wrote:
>
> 1) Does anyone have schematics of their OWN regennies which they might
> mail to me for an SASE? Hand drawn is fine.
I have mine on my glowbugs page http://www.algonet.se/~janax/glowbug.htm
It ain't quite ready yet but works fairly well.
>
> 2) Bob Keys mentioned "...glass plate capacitors..." in one of his posts
> on Hartleys. How does one figure the capacitance, etc? Or do you just make
> some out of, say, 3" square glass plates and tin-foil, and measure them
> later?
If we can determine the relative dielectric constant for typical glass, we
can calculate the capacity, perhaps capacity per sq. inch with a given
glass thickness. I'll look in some books here and see if I can find something.
Jan, SM5GNN
Date: Fri, 5 Dec 1997 12:16:22 -0500 (EST)
From: "Roberta J. Barmore" <rbarmore@indy.net>
Subject: Testing 01As in a Hickock
Hi, Gang!
A little problem has cropped up, trying to check out some condition
unknown 01As and (oh, the horror!) I haven't got a listing of settings for
'em for the Hickok 533A. Settings from a 535, 600A, or 605A will do, they
all used the same roll-chart. (Frustrating, between two roll charts, a
"supplement" and the official obsolete tube listing, there's no mention of
01A I can find!)
The project at hand (and cause of my correspondence being so laggard,
apologies to eveyone I owe private e-mail) is the construction of a
breadboard TNT rig. Got the bug pretty bad when folks were talking about
the AWA contest. (May not make that'n, have to work overnight tonight and
it usually messes up the weekend). Why a TNT and not a Hartley? Well, I
built Hartleys 20+ years ago; never tried a TNT. Will it work? I dunno.
I do have one '10 (thanks, Tom Adams!) but the use of 15 9V batteries for
the B supply makes an 01A a better choice. (It's also a little easier to
light them up!) Almost borrowed a shoulderless '45 (the "S" envelope)
from the old RCA Radiola but thought better of it; if anything happened it
would be difficult to replace exactly.
...Hoping the Pilot staright-line-frequency variable condenser will
work all right; the only other 500pF condensers on hand are modern Johnson
types, long and skinny and a little too new-looking for the project!
73,
--Bobbi
Date: Wed, 10 Dec 1997 07:31:18 -0800 (PST)
From: Ken Gordon <keng@uidaho.edu>
Subject: Re: Regennies, etc..
> If we can determine the relative dielectric constant for typical glass, we
> can calculate the capacity, perhaps capacity per sq. inch with a given
> glass thickness. I'll look in some books here and see if I can find something.
Thanks, we await the results of your research.
Ken
Date: Wed, 10 Dec 1997 07:45:31 -0800 (PST)
From: Ken Gordon <keng@uidaho.edu>
Subject: Regenny...
I have redrawn and submitted the Jones "One-Tube" regen rx to my (as yet
unfinished) web page for your perusal and comments.
URL is:
http://www.mines.uidaho.edu/~keng/schematics/jonesregen/
I am working on getting some better software so that my scanned copies
don't lose so much resolution when resized to fit the screen.
In any case, these can all be printed off directly from your browser.
For the Jones regen, I suggested a 1G6 since its specs match as closely as
I could come up with, the specs of the original #19, but with a 1.5 volt
filament so you won't have to use a filament rheostat.
Description and links back to the home page will follow ASAP.
I also made ONE change in the W5TVW PP rig suggested by Sandy: the 6.8 k 2
watt resistor has been changed to 6.8K 5 watts.
Again, the URL for THAT rig is:
http://www.mines.uidaho.edu/~keng/schematics/w5tvw/
Ken W7EKB
Date: Wed, 10 Dec 1997 10:34:10 -0600
From: w5hvv@aeneas.net (Roderick M. Fitz-Randolph)
Subject: Hartley Grid Resistor
Well, folks... if ignorance is bliss, I must be the happiest guy
in the world.
Following suggestions regards the wattage of a grid resistor for
a Hartley, I ordered a variable 25K lug resistor (225 watts),
thinking that if dissipated heat might in any way affect the
resistance and therefore possibly the frequency, I would "gold
plate" this baby and buy the biggest variable resistor available.
Well, it just arrived from Mouser Electronics and the humongous
Moger is 10 1/2" long and 1 1/8" in diameter!!!! Am I blissful,
or what?
Will order their 100 watt unit and see if it will fit on my Oak
bread board a little better. Anyone need a humongous Ohmite
vitreous enamel variable 50K ohm resistor. I paid $20+ to have
it delivered. Will sell it for $10 (with the end-holders) to
whomever needs something like this. Anyone making an 833 Hartley?
Rod, N5HV
w5hvv@aeneas.net
Date: Wed, 10 Dec 1997 12:06:58 -0500
From: "Ornitz, Barry L" <ornitz@eastman.com>
Subject: Parallel Plate Capacitors
To a first approximation, the capacitance of a parallel plate capacitor
is:
C = E * A / t
where: E (epsilon) = permittivity of material between the plates
A = area of plates (assumed equal on both sides)
t = separation between the plates
and: E = Eo * K
where: Eo = permittivity of vacuum = (8.842E-12 farads/meter)
K = dielectric constant of the insulating material.
The dielectric constant will depend on the type of glass used. For
ordinary soda-lime glass, it is about 8.3; for Pyrex it is about 4.8;
and for quartz the dielectric constant is 3.85.
Some other dielectric constants to remember are:
air - 1.000
teflon - 2.1
polyethylene - 2.26
ruby mica - 5.4
Remember when calculating the capacitance, all the units must be
correct. Thus the area and thickness will normally be measured in m^2
and m. In calculating the capacitance of air variable capacitors, this
formula will produce capacitance values which are slightly low due to
end effects and the effect caused by the rotor shaft.
73, Barry L. Ornitz WA4VZQ ornitz@tricon.net
>From: Ken Gordon [SMTP:keng@uidaho.edu]
>2) Bob Keys mentioned "...glass plate capacitors..." in one of his posts
>on Hartleys. How does one figure the capacitance, etc? Or do you just make
>some out of, say, 3" square glass plates and tin-foil, and measure them
>later?
>
>Ken W7EKB
>
Date: Wed, 10 Dec 1997 11:05:55 -0700
From: Dexter Francis <cwest@xmission.com>
Subject: Re: Parallel Plate Capacitors
I've had lots of fun making parallel plate caps out of
adhesive backed copper foil tape. (You can solder to
it!)3M still sells gives rolls of it away in their EMI
supression kits. The last ones I made were for a little
crystal radio project for my son.
BTW I bought one of the Tenma LCR meters from MCM and it's
a terrific unit for the money ($100). I'd bought one from
TechAmerica a while back and the darn thing was useless below
40 pf. It had no zero capability and never showed less than
about 60 pf regardless. I was very dissapointed as it was
made in the USA and I expected better.
- -df
- ----------------------------------------------------
Need to Buy or Sell Tubes, Parts or BA Gear?
Visit our Web site at http://www.xmission.com/~cwest/
e-mail to: tubes@usa.net -or- cwest@xmission.com
P.O. Box 22443, Salt Lake City, Utah 84122
End of glowbugs V1 #203
***********************