Subject: GLOWBUGS digest 339

From: [email-masked]
Date: Sat, 2 Nov 1996 09:39:02 -0600 (CST)

GLOWBUGS Digest 339

Topics covered in this issue include:

  1) Re: BA net
	by [email-masked]
  2) FS/TRADE LIST....357 LINE'S
	by "Robert Fowle  (KC8DBC)" <[email-masked]>
  3) 
	by "Robert Fowle  (KC8DBC)" <[email-masked]>
  4) Re: Tube Reactivation Inf
	by [email-masked] (Ralph Hartwell)
  5) Re: Solving the copyright problem
	by [email-masked]
  6) Bravo on QST request
	by Gordon Gekko <[email-masked]>
  7) Re: Bravo on QST request
	by [email-masked]
  8) 1625s
	by [email-masked]
  9) Source of Screws??
	by "James P. Rybak" <[email-masked]>
 10) Re: Tube Reactivation Inf
	by [email-masked]
 11) Homebrewing Tubes
	by [email-masked]

----------------------------------------------------------------------

Date: Fri, 1 Nov 1996 13:00:03 -0500 (EST)
From: [email-masked]
To: [email-masked]
Cc: [email-masked] (), [email-masked]
Subject: Re: BA net
Message-ID: <[email-masked]>

> 
> Could someone please tell me the frequency of the Net and the time?
> I thought it was 7050kc. but dont really remember.
> thanks, rich, wd6fdd
> 

Well, the usual has been 0200Z/7050khz, 0300Z/3579R545khz, 
0400Z/1802R500khz, 0500/3579R545KHZ.

In general meet on 7050 or 3579R545 anytime after dark, but most
offical nettish times are as above.

Call:   CQ BA CQ BA DE yourcall yourcall K

Start about on the hour until about 5 min after and if no-one shows up,
try the next net time/frequency.

Remember, it is an informal roundtable, unless a herd shows up, and then
a sort-of net structure will be followed.

73/ZUT DE NA4G/Bob UP

------------------------------

Date: Fri, 1 Nov 1996 13:40:43 -0500
From: "Robert Fowle  (KC8DBC)" <[email-masked]>
To: [email-masked]
Subject: FS/TRADE LIST....357 LINE'S
Message-ID: <[email-masked]>

If you'd like this list email me....i want to find homes for this stuff....
the list has prices..as always, offers are welcome....
thank you

=================================================]-[->
Robert Fowle      KC8DBC
The HAMMARLUND Historian
Ph. 517-789-6721
1215 Winifred
Jackson, Mich. 49202-1946
E-mail:  [email-masked]
Web Page:  http://www.jacksonmi.com/hammarlund
                 HAMMARLUND LITERATURE WANTED
WANTED: MANUALS FOR ANY MAKE RADIO EQUIPMENT
=================================================]-[->
Boatanchors: the list: [email-masked]......subscribe boatanchors
<your name>
       the news group: rec.radio.amateur.boatanchors
             news group: ham-am@[email-masked]....Body: add ham-am		

------------------------------

Date: Fri, 1 Nov 1996 15:15:14 -0500
From: "Robert Fowle  (KC8DBC)" <[email-masked]>
To: [email-masked]
Message-ID: <[email-masked]>

there are some of you, whom iv'e sent the list too, and it has bounced back.
if you ask for it, and haven't got it, i can send it as an attached file, or
can post 
it to rec.radio.amateur.boatanchors (which i have done)

=================================================]-[->
Robert Fowle      KC8DBC
The HAMMARLUND Historian
Ph. 517-789-6721
1215 Winifred
Jackson, Mich. 49202-1946
E-mail:  [email-masked]
Web Page:  http://www.jacksonmi.com/hammarlund
                 HAMMARLUND LITERATURE WANTED
WANTED: MANUALS FOR ANY MAKE RADIO EQUIPMENT
=================================================]-[->
Boatanchors: the list: [email-masked]......subscribe boatanchors
<your name>
       the news group: rec.radio.amateur.boatanchors
             news group: ham-am@[email-masked]....Body: add ham-am		

------------------------------

Date: Fri,  1 Nov 1996 20:46:00 GMT
From: [email-masked] (Ralph Hartwell)
To: [email-masked]
Subject: Re: Tube Reactivation Inf
Message-ID: <[email-masked]>

W>Suppose you have a thoriated tungsten filament tube and the rejuvination
W>process doesn't work.  (It eventually will not work when no more thorium is
W>available to be boiled to the surface).  In that case how about just using it
W>as a tungsten filament tube, that is, jack the filament voltage up until the
W>tube glows good and bright and puts out plenty of electrons.  Seems to me

   That works - sort of - but usually by that time the cathode is only
emitting electrons from a few areas instead of the entire cathode
surface.  As a result, the tube exhibits varying control characteristics
and may be unstable.  High power xmtg tubes will show uneven anode
heating, sometimes showing very hot spots, even to the point of melting
holes in the anode.  In addition, the excess heat may cause the tube to
go gassy, but what the heck - if the tube is useless anyway, you've got
nothing to lose by trying.

   Ralph

---
 þ QMPro 1.53 þ <<---- THIS SPACE FOR SALE ---->> ; send cash only!

------------------------------

Date: Fri, 1 Nov 1996 18:04:20 -0500
From: [email-masked]
To: [email-masked]
Subject: Re: Solving the copyright problem
Message-ID: <[email-masked]>

I second Jeff's motion for creating our own library of circuits of our own
designs.  I will sign up to document my next project, a push-pull
oscillator/transmitter for 80/40 meters.  My idea here is to use two of the
low cost series string power pentode tubes in a classic push pull oscillator
configuration.  At first I thought about using 50L6s but then I saw that
12L6's are less than $2.00 at AES.  These tubes are not the same as the
classic 6L6 with a different heater but, they are respectable.  They have a
10 Watt plate dissipation and like to work at Voltages between 100 and 200
Volts.  This will let me use an isolation transformer for power.

If this project goes well, I am thinking about a monster push-pull oscillator
using 1625s.  I recently acquired four large crystals ground just below the
80 meter band.  The quartz slap is the size of a postage stamp and should
handle the current.  Oops, I'm getting ahead of myself.  Any comments and/or
advice on my pp xxL6 transmitter are welcome.

73,

Eric, WD6DGX
Cupertino, California

------------------------------

Date: Fri, 1 Nov 1996 15:40:33 -0800 (PST)
From: Gordon Gekko <[email-masked]>
To: [email-masked]
Subject: Bravo on QST request
Message-ID: <[email-masked]>

Great letter, robert!

I too will wait with baited breath.  The scans I have in my machine are all
from ARRL publications of the bygone era, and easily cited with credits.

Thanks for the efforts!  

..Waiting for the 'big' reply...

Dave WB7AWK
[email-masked]>

------------------------------

Date: Fri, 1 Nov 1996 17:45:08 -0700 (MST)
From: [email-masked]
To: Gordon Gekko <[email-masked]>
Cc: Multiple recipients of list <[email-masked]>
Subject: Re: Bravo on QST request
Message-ID: <[email-masked]>

On Fri, 1 Nov 1996, Gordon Gekko wrote:

> Great letter, robert!
> 
> I too will wait with baited breath.  The scans I have in my machine are all
> from ARRL publications of the bygone era, and easily cited with credits.
> 
> Thanks for the efforts!  
> 
> 
> ..Waiting for the 'big' reply...
> 
> 
> 
> Dave WB7AWK
> [email-masked]>
> 

   I also applaud Bob Keys for his efforts.  He really binds this
   group together.  The info that he posts answers many of my questions
   before I even get around to asking them.

   I would really love to see those Reinartz Regen articles.  Those 
   breadboard/busbar/screw terminal tube socket projects are so appealing.
   Spiderweb and Lorenz coils really fascinate me.  I also love reading
   about how early hams ingeniously home-brewed capacitors, transformers,
   and other parts taken for granted as "factory-made" later on. 

   My main library is well-supplied with QST issues from 1925 to the
   present, thanks to a local ham who donated his entire collection in
   1973.  However, those really early issues were before he started
   his subscription, I guess.  Those pioneer issues (1915 - 1924) 
   have eluded me anywhere locally, so I eagerly await seeing any
   articles from them.

   ** Shane Wilcox <[email-masked]> **              

------------------------------

Date: Fri, 1 Nov 1996 21:39:04 +0000
From: [email-masked]
To: [email-masked]
Subject: 1625s
Message-ID: <[email-masked]>

Hi Gang

First post to this list. I just got my hands on a military 
transmitter like the one I used as a novice in 1952. The model number 
is  BC-696A. Any idea where I can find a manual or at least a 
schematic. I remember we gutted the vfo and made it xtal control 
because novices in those days were limited to xtal control.

The rest of my novice days is a story for a future post.

73...de....W8LRM

------------------------------

Date: Fri, 1 Nov 1996 20:33:32 -0700 (MST)
From: "James P. Rybak" <[email-masked]>
To: Glowbugs <[email-masked]>
Subject: Source of Screws??
Message-ID: <[email-masked]>

I've got some ba gear with some screws missing.  (The equipment has some 
screews missing, not me!)  Where is a good source of 8-32 by 1/4" pan head 
machine screws?  I only need a few but I want to buy brand new ones so 
that the screwdriver slots are nice and sharp.  If I find a good source, 
I will stock up on some other sizes as well.

Thanks.

Jim   W0KSD

------------------------------

Date: Sat, 2 Nov 1996 09:22:50 -0500
From: [email-masked]
To: [email-masked]
Subject: Re: Tube Reactivation Inf
Message-ID: <[email-masked]>

In a message dated 96-11-01 16:43:52 EST, you write:

<< 
    That works - sort of - but usually by that time the cathode is only
 emitting electrons from a few areas instead of the entire cathode
 surface.   >>

 Hi Ralph, thanks for the comments, yes my main thought was that at that
point you've got nothing to lose.  

I'm not quite sure what you mean by "the cathode is only emitting electrons
from a few areas ...."  I envision the tube being a filament type without a
separate cathode and the emission from the filament being purely from the
filament as a piece of hot tungsten without any thorium or other aids to
emission.  I believe that any remaining thorium would be quickly driven off
at the higher operating temperature 2500 to 2600 degrees K versus 1950 to
2000 degrees K for the thoriated filament.  There's probably more to it than
my simplified view and I just wondered if you had any more details?
  
p.s. I wouldn't try this on a power tube unless I was really desperate.

Thanks Bob [email-masked]

------------------------------

Date: Sat, 2 Nov 1996 09:23:01 -0500
From: [email-masked]
To: [email-masked]
Subject: Homebrewing Tubes
Message-ID: <[email-masked]>

While reading some old QST's I came across the following in QST for June
1945.  I thought it might be interesting to some of you who have been
discussing homebrew tubes.  It does not contain any really useful information
for those wanting to make tubes, but shows that it can be done.
------------------------------------------------------------------------------
----------------------------------------------------
>From June 1945 QST pages 58&84

REPORT ON AMATEUR TUBE MAKING
3035 East Van Buren, Phoenix Ariz.
Editor QST:
     I noticed in the January, 1945, issue of QST that T/Sgt. Warren H.
Donnelly asks about glass blowing, vacuum pumps and tube parts.  I wondered
if there are others interested enough to know about and use these things.  
     I made my first tube nearly twenty years ago and have made many
electronic devices since and always as an amateur.  The great mystery of the
vacuum tube is not hard to unravel.  The hardest part is finding the
necessary information and the patience to learn glass working.  Glass blowing
is a matter of practice.  Vacuum technique is a matter of catching all the
little things.  Tube parts usually can be made from materials found in the
home, with the exception of glass tubing and filaments or cathodes.
 Oxide-coated heaters and filaments are not too difficult.  You can make
metal tubes easily in some cases.  "Getters" are easy to use when you once
know how.  A small one-piece motor, vacuum pump, and blower (or air pressure
pump) can be built.  This is used for air for a homemade glass-blowing torch
and a vacuum pump for the rough vacuum.  The high vacuum is produced by a
diffusion-, or condensation-pump, and is made entirely of glass.  Tools such
as small jigs, a small spot-welder, torches, etc., all are easy to make.  
     It costs less to buy a finished tube, but one can not always find just
that special tube, and glass blowing and tube making are lots of fun for
those who like to learn and build such things.  For those who are very
serious about the scientific angle or who for other reasons of their own
desire to be able to build tubes of various kinds -- it can be done at home.

C. N. Lowenstein W6TEG 
------------------------------------------------------------------------------
---------------------------------------------------
Hope some of you found this interesting

73   Bob   [email-masked] 

------------------------------

End of GLOWBUGS Digest 339
**************************