Subject: GLOWBUGS digest 337

From: [email-masked]
Date: Thu, 31 Oct 1996 09:38:39 -0600 (CST)

GLOWBUGS Digest 337

Topics covered in this issue include:

  1) Re: BAs Forever! HB Tubes
	by [email-masked] (Steve Byan)
  2) Re: Curling Up With A Good Read
	by [email-masked] (Jeff Duntemann)
  3) Night Deposit Made at the All-Night Tube Bank
	by [email-masked] (Jeff Duntemann)
  4) Re: Night Deposit Made at the All-Night Tube Bank
	by [email-masked] (Jeff Duntemann)
  5) Tube Reactivation Info Sheet - 1927 ARRL Handbook
	by [email-masked]
  6) What is a 1229 tube?
	by [email-masked]
  7) Copyright Info
	by Ornitz_Barry <[email-masked]>
  8) 6AE8/X77 tube
	by [email-masked]
  9) Re: BAs Forever! HB Tubes (fwd)
	by Jeffrey Herman <[email-masked]>
 10) tubes
	by [email-masked] (Stiles D Daniel)
 11) Regens & Things that go "SSsssssst" in the night
	by [email-masked] (Richard H. Arland)
 12) Re: Glowbugs admin ... please read.
	by [email-masked] (Richard H. Arland)
 13) tubes
	by [email-masked] (Murray Kelly)
 14) COnnector needed
	by "Brian Carling" <[email-masked]>
 15) Schematic/manual photocopy needed
	by "Brian Carling" <[email-masked]>
 16) Thordarson Transformer Info Sheet
	by [email-masked] (Daniel Wright)
 17) Tnx for Absolution
	by "Edward A. Stagl" <edstagl>
 18) input tuning of 4cx250
	by Rossi Giuseppe <[email-masked]>

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

Date: Wed, 30 Oct 1996 10:49:49 -0400
From: [email-masked] (Steve Byan)
To: [email-masked], [email-masked]
Subject: Re: BAs Forever! HB Tubes
Message-ID: <[email-masked]>

(A copy of this message has also been posted to the following newsgroups:
rec.radio.amateur.boatanchors)

[a thread started on the boatanchors list about homebrewing tubes]
Bill Meara <[email-masked]> wrote:
>I came across an article [in the April 1965 issue of QST ]
>that hints at a way to keep our beloved
>Boatanchors on the air forever!   "Vacuum Tubes the Hard Way - Building
>Home-made Tubes"  describes the successful tube-making efforts of Sam Diaz
>Pumara,  ex LU2DH.  Sam built lots of receiving and transmitting tubes in his
>basement shop using mid-60's technology. 

If you're contemplating homebrew tubes, the "Amateur Scientist" column of
the current issue of Scientific American describes a simple high-vacuum
pump and a package deal for a kit of the items made of unobtainium. It's a
sorbtion pump, so the only "unobtainium" needed is the molecular sieve and
the vacuum guage, and I gather they really aren't that hard to find. The
scheme looks like fun; you get to fill your beer cooler with liquid
nitrogen.

BTW, Linday Publications has a reprint of "Experimental Physics" which has
a good intro to vacuum systems. Lindsay also offers a modern text on
experimental physics (the title of which escapes me) that has a good list
of sources. 

Regards,
-Steve

-- 
Steve Byan                                  internet: [email-masked]
Hitachi Computer Products (America), Inc.   
1601 Trapelo Road                           phone: (617) 890-0444
Waltham, MA 02154                           FAX: (617) 890-4998

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

Date: Wed, 30 Oct 1996 08:54:38 -0700
From: [email-masked] (Jeff Duntemann)
To: [email-masked]
Cc: [email-masked]
Subject: Re: Curling Up With A Good Read
Message-ID: <[email-masked]>

At 09:38 AM 10/30/96 -0600, you wrote:

>Just took delivery on a package from Lindsay Publications and now I can't
wait for a
>chance to curl up with one of these wonderful books. I got copies of Elmer
Buchers's
>"Wireless Experimenter" and his "Vacuum Tubes in Wireless Communication".
Also got two
>of the nice little Gernsback Educational Library reprints, NO. 1 and 2,
"How To Build
>4 Doerle Short Wave Sets", and "How To Make The Most Popular All Wave 1 and
2 Tube
>Receivers". The Bucher books were $13.95 and $12.95 and the Gernsback books
were $2.25
>each. What a bargain! Lindsay is at PO Box 538, Bradley, IL 60915-0538,
815/935-5353,
>and have a swell catalog. Bob Keys is right, the Buchers books seem like a
must read
>for glowbuggers! Ya' oughta have a catalog.

Nay, you MUST have a catalog.  I'm sure I've dropped over a kilobuck in
Lindsay's lap over the years.  Most of my reprint (rather than yellowed and
falling apart) glowbug literature has come from this odd little place.  I
didn't see RADIO FOR THE MILLIONS in their recent catalog, but I bought mine
there and if it's still in print that's one I would buy.  It's a little
newer than the others (about 1940) and has more sophisticated circuits than
all the 1924-vintage books, as well as calling out parts that are slightly
easier to find.

I actually have an original (yellowed and falling apart) copy of that 4
DOERLE SHORTWAVE SETS book that my father bought in 1936.  Nice little book,
especially if you have good eyes.  (Very small print and fine lines.)

But again, essential for your catalog.  And y'awll DO have a catalog file, no?

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona

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

Date: Wed, 30 Oct 1996 08:59:10 -0700
From: [email-masked] (Jeff Duntemann)
To: [email-masked]
Subject: Night Deposit Made at the All-Night Tube Bank
Message-ID: <[email-masked]>

Hi gang--

I decided to send the box of TV rectifier and oddball TV tubes to the tube
bank called out in a recent QST and mentioned here in an earlier message.  I
had missed that, but it makes a certain sense.  Guys who are restoring
classic TVs might be able to make use of them.

Thanks to everybody who offered to take them.  This way, I felt, would
expose the tubes to the most possible "new homes."  And really, they are
*not* anything you would ever use in either transmitters or receivers.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona

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

Date: Wed, 30 Oct 1996 10:02:03 -0700
From: [email-masked] (Jeff Duntemann)
To: Roy Morgan <[email-masked]>
Cc: [email-masked]
Subject: Re: Night Deposit Made at the All-Night Tube Bank
Message-ID: <[email-masked]>

>>I decided to send the box of TV rectifier and oddball TV tubes 
>
>....  And really, they are
>>*not* anything you would ever use in either transmitters or receivers.
>
>Hmmm .... Most everthing around here uses 5U4's!  
>(I've got a bushel of TV pulls - a lifetime supply.)

That box contained nothing as valuable as a 5U4.  There is a class of
high-voltage TV rectifier tubes with a 1 volt filament and a plate cap, I
assume (I know NADA about TV internals) to rectify the CRT high voltage out
of the flyback.  1G3 is typical, but there are a bunch of them.  Those, and
those other lower-voltage rectifiers with a spiral filament (no numbers pop
into my mind) are most of what I had in the box.  5U4s are definitely
keepers in this business; the 5U4 is, after all, Son of 80.

Nothing truly useful got away in that one.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona

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

Date: Wed, 30 Oct 1996 15:20:12 -0500 (EST)
From: [email-masked]
To: [email-masked]
Cc: [email-masked] ()
Subject: Tube Reactivation Info Sheet - 1927 ARRL Handbook
Message-ID: <[email-masked]>

While perusing an ancient 1927 ARRL Handbook, I found the following info
on reactivation of thoriated tunsten tube filaments, that might be of use.
Another good source of such info is Ghirardi's ``Radio Physics Course''.
Strip here and print out if needed.....73/ZUT DE NA4G/Bob UP
*******************************************************************************

                                 TUBE REACTIVATION

               When the filament emission of ``XL''-filament tubes becomes
          reduced  from  many  hours  of  normal  use or from operation at
          excessive plate voltage and plate  current  (this  happens  most
          often due to misadjustment or overloading of the transmitter) it
          is necessary to run the tubes at a higher filament voltage  than
          normal  for  some  time  WITH THE PLATE VOLTAGE OFF and the grid
          disconnected.  This process tends to bring active thorium to the
          surface  of the filament, renewing the available electron supply
          under operating conditions.

               XL-filament tubes  (having  thoriated  filaments)  must  be
          differentiated from tubes having oxide-coated filaments (Western
          Electric) which cannot be reactivated.  In long-continued normal
          operation  there  is  a  gradual  decrease  in the plate current
          resulting in gradually decreasing  output.   The  old  types  of
          tungsten-filament  (bright)  tubes  have a more limited emission
          remaining constant until burn-out of the filament.   XL-filament
          tubes  may  still  glow  at  their  normal dull brilliancy after
          continued use and after the  electron  emission  is  practically
          zero.   They  may  be  reactivated  several  times,  doubling or
          tripling tube life.

               Various ``reactivators'' on the market differ  somewhat  as
          to  the  flashing  voltage  and  time  and the subsequent ageing
          voltage and time.  Tubes  of  similar  type  made  by  different
          concerns  also differ somewhat in filament characteristics.  The
          tubes must be connected in a circuit  so  that  the  cooking  or
          ageing  process  at  once  follows flashing.  While flashing and
          cooking are recommended for receiving tubes of the XL-type whose
          emission  has  fallen  below manufacturer's ratings, cooking for
          longer  periods  (several  hours  in  some  cases)  without  the
          flashing  process is to be preferred for transmitting, rectifier
          and power amplifier tubes.

               The tubes should test up to  manufacturer's  ratings  after
          reactivation.   The  grid  and  plate  may  be tied together and
          connected through B-battery, milliammeter and switch to filament
          for  testing emission.  Under these conditions the switch should
          be closed very briefly while the emission current  is  measured.
          50-volts  (not  more) is a convenient B-value for 3- and 5- volt
          tubes.  With filament normal at 5 volts  the  following  MINIMUM
          values may be expected:  200-A, 12 m.a.; 201-A, 25 m.a.; 171, 50
          m.a.  A UX-210 with 6 volts on the filament and 100 volts on the
          plate  and grid should pass 100 m.a.  Remember that the B-supply
          source must be of low internal resistance, however.

                              TUBE REACTIVATION TABLE

          ----------------------------------------------------------------
                                     Flashing          Ageing
          TUBE                       Volts   Time      Volts   Time
          ----------------------------------------------------------------
          UV-199                     12      1 sec.    4       5-8 min.
          UX-199
          C-299
          CX-299
          ----------------------------------------------------------------
          UX-171                     18      1 sec.    7       5-8 min.
          UX-200A
          UX-201A
          CX-300A                    18      1 sec.    7       5-8 min.
          CX-201A
          CX-371
          ----------------------------------------------------------------
          UX-210                     no flashing       9       15-30 min.
          UX-216B
          CX-310
          CX-316B
          ----------------------------------------------------------------
          UX-213                     no flashing       6       15-30 min.
          CX-313
          ----------------------------------------------------------------
          203-A                      no flashing       12      30 min.
          ----------------------------------------------------------------

          This information is from the 1928 American Radio Relay League
          ``The Radio Amateur's Handbook'', 3rd ed., pages 204 and 205.

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

Date: Wed, 30 Oct 1996 16:35:22 -0500 (EST)
From: [email-masked]
To: [email-masked]
Cc: [email-masked] ()
Subject: What is a 1229 tube?
Message-ID: <[email-masked]>

I found an old 4 pin ST tube with a plate cap, marked 1229, by Sylvania.
It looks suspiciously like an old Beckman DU spectrophotometer tube, because
of a wire wrapped around the base of the glass for shielding purposes.
Is there a cross or similar standard tube comparable to it?
Maybe it would make a good regen detector tube?

Bob/NA4G
[email-masked]

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

Date: Wed, 30 Oct 1996 17:57:12 -0500
From: Ornitz_Barry <[email-masked]>
To: [email-masked]
Subject: Copyright Info
Message-ID: <[email-masked]>

I was afraid this would happen - everyone is trying to interpret the 
copyright rules but few have even a little understanding of them.  I 
thought I understood the fundamentals too - that is, until I started 
researching the actual rules.  Allow me to address a few particular 
points, please.  I hope my upcoming FAQ will answer the rest of the 
questions (I have been working on it intermittently for at least a 
month now).  I do not wish to include names in the following, only 
issues.

        Maybe only original designs or modifications of published ones, 
        or something.

This is fine if the authors give you their designs for distribution.  
With modifications, if they are not substantial and a significant portion 
of earlier work is included, you should be careful.

        Well guys I don't think he can go wrong with scans of hand-drawn 
        schematics, ESPECIALLY since he doesn't plan to sell them or to 
        distribute them outside of a small circle of non-commercial 
        hobbyists who are not doing anything for profit.

As long as the hand-drawn schematics are original...  Hand drawing a 
schematic from QST is not OK for distribution without permission.

        I know also that the world is just not exactly sweating it over 
        the commercialization of technical ideas that went by the wayside 
        30-50 years ago! There is no exchange of money involved, just 
        thoughts.

The problem is that the law really does not care whether money is 
involved or not to decide copyright infringement.  It might affect the 
penalties, however.

        I have to agree with this one. Somewhere in copyright law is 
        loopholes for non-profit use. Home video & audio tapers get away 
        with it all the time. I don't see any alt.binaries.pictures.etc 
        posters going to jail either. None of the used record dealers get 
        hassled by the record companies at collectors shows. Yes I can 
        see getting permission BEFORE selling a book full of other
        peoples schematics but offering scanned copies that aren't sold? 
        Thats overreacting folks! 

The so-called loophole is known as "fair use" doctrine and it has 
nothing to do with commercial or noncommercial use.  It relates to 
individual use for certain activities such as personal study.  Note 
that I said INDIVIDUAL use.  Used records are just like used books; 
the author has already collected his fee.  But while you can make a 
copy for yourself, you cannot make copies for others.  There have been 
some significant fines levied on people who illegally distributed 
copyrighted material (including scanned photographs) over the 
Internet.  Playboy and Microsoft are two companies who have won 
judgments.

        Well, technically, it is illegal to copy a video tape or to tape 
        a phonograph record or CD even though it's done all the time. I 
        think the answer is - is it for educational purposes? The 
        copyright laws are different in that case.

Copying a video tape or phonograph record is perfectly legal under the 
right conditions, i.e. you already own the original.  Copyright rules 
apply to educational uses the same as they do for commercial uses.

        Where would I check out the copyright law anyway? I want to read 
        the whole thing.

Having searched for this information, I can say that just reading the 
law alone is not sufficient.  Much of the actual implementation of the 
law is determined by the collected rulings of court cases.  This is 
why I suggested that everyone cool their heels for a while and wait 
until I can finish the FAQ I am writing.  Remember this is not a high 
priority project (but I will gladly turn it over to anyone else who 
wants to work on it).  Certain aspects of the Berne Convention are 
still being decided in the courts today, and the rapid rise in 
electronic publishing and distribution have only clouded the issues.
Even finding out what is covered by the copyright act and what is not 
can be difficult to answer.  Conard Murray asked me about old books, 
like those John Heck mentioned that Lindsey had republished:

        Do you think checking the Library of Congress listings would tell 
        us if someone's great-great grandson renewed the copyright on a 
        book? 

Conard is on the right track here as the Copyright Office falls under 
the jurisdiction of the Library of Congress.  I am still looking into 
this question.

The Copyright Office does have a number of documents available to help 
explain copyright law.  Most are available over the Internet (start 
searching at <locis.gov>).  There is also an existing copyright FAQ
by Brad Templeton that is posted on Usenet frequently in the following 
groups:
        news.announce.newusers, news.admin.policy, misc.legal,
        misc.legal.computing, misc.int-property, misc.answers, 
        news.answers

Look for an article entitled:

        Copyright Myths FAQ: 10 big myths about copyright explained.

This subject is NOT something I enjoy writing about.  I pointed out a 
few things to Jack Hill on Boatanchors and Jack immediately 
"volunteered" me to write something up.  The purpose is to help folks 
to understand the law and how it applies to our hobby (and to make 
sure the mailing lists do not become guilty by association too).

                        73, Barry L. Ornitz  WA4VZQ  [email-masked]

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

Date: Wed, 30 Oct 1996 15:40:01 -0800
From: [email-masked]
To: [email-masked]
Subject: 6AE8/X77 tube
Message-ID: <[email-masked]>

I have here a dozen of what I thought were 6EA8 tubes to substitute for the 
6U8s in my KWM2-A because 6U8s have been a pain over the years. So I replaced 
the 4 6U8s with what I thought were 6EA8s. Imagine my surprise when I turned 
the radio on and it was as dead totally and absolutely. PANIC!!!!
So I pulled out one of the tubes and inspected it more carefully. Clearly said 
6AE8/X77. Does anyone know what this tube is for. I can't find it in any of my 
manuals. The tubes were manufactured by AWV (RCA affiliate in Australia) so 
they may be some British type. 
73 de Dave KI6QE/7

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

Date: 	Wed, 30 Oct 1996 15:29:32 -1000
From: Jeffrey Herman <[email-masked]>
To: Glowbugs List <[email-masked]>
Subject: Re: BAs Forever! HB Tubes (fwd)
Message-ID: <[email-masked]>

There is an ongoing discussion of homebrewing tube on the BA list (it
comes up about every 6 months or so). If you're not sub'd to that list
the $12 per year is surely worth every cent (and then some!).
KH2PZ

---------- Forwarded message ----------
Date: Wed, 30 Oct 1996 14:15:16 -1000
From: Richard Hager <[email-masked]>
To: Multiple recipients of list <[email-masked]>
Subject: Re: BAs Forever! HB Tubes

William Hawkins wrote:
> 
> The April issue, eh?  I think our tubes require a better vacuum than what one
> can make at home - even if you could find the other exotic materials that you'd
> need.  But if we could convince the guitar-amplifier crowd that homemade tubes
> sound 'better', then maybe they'd quit consuming (as in burning up) good tubes
> by exceeding their ratings.-- 

Welllll, I don't know.  You can pick up surplus/used lab vacuum pumps for a few 
hundred bucks that go down to, I think, .1u or so.  If I understand correctly, a 
mech pump only goes down so far, after that you need a sorbtion (sp?) pump, which 
is like a giant recyclable 'getter'.

Speaking of which, I think that some getter materials adsorb an amazing mass of 
gas.  It may well be feasible to design in a fairly large getter, and then the 
mech vacuum pump may take us far enough down.  Frankly, my concern is in 
effective and -consistent- cathode coating.  And in winding those tiny grid 
wires.  I'm not sure any of us have the eyes to do that any more!!

For the past 2 years I'd been toying with this concept anyway, but specifically 
for cheap 2kw tubes for induction heat treating of punches/cutting tools.  I 
reasoned that copper tubing and metal screen material just might cut it, since I 
only need operation to a couple hundred khz, but I hadn't figured out the cathode 
yet.  It's quite possible that that sort of crude construction would work fine up 
to 160 or even 80M.  But over that, I think it would take more traditional 
glass/fine wire/close spacing, etc...

This is fascinating, whatever comes out of it!

        Richard Hager

+ Ah-ha! Design Group, Inc.           -
+ Precision CNC Technology, since 1991 -
+ 612-641-1797, Fax: 612-641-8681       -
+ "I just like to build stuff" So...     -
+ for CNC info, don't email me, call      -
+ or email Ah-ha! directly.  Thanks!       -
+ www.gdic.com/ahha  email: [email-masked]   -

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

Date: Thu, 31 Oct 1996 00:16:24 EST
From: [email-masked] (Stiles D Daniel)
To: [email-masked]
Subject: tubes
Message-ID: <[email-masked]>

Been following the thread and have already sent a couple of private
messages.  

I try to repair equipment for school ham club from some of the donations
we get.

Looking for a pair of 6146's, a 6EA8 and a 6AU6 to put an old Heath
SB-401 back on the air.

I have a pair of finals from a Swan 350 too far gone to repair plus some
mechanical parts for the 350 if anyone needs them

tnx and 73
Dan KB1BG

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

Date: Thu, 31 Oct 1996 02:30:25 PST
From: [email-masked] (Richard H. Arland)
To: [email-masked]
Subject: Regens & Things that go "SSsssssst" in the night
Message-ID: <[email-masked]>

Gang:

OK shoot me! Go ahead. I've been bad. Very, VERY bad. I haven't been
saving the postings about regens. Now I decided (today) to take the old 3A4 regen Rx out of the cabinet and get it to play right after about a
year of procrastination, and I realize that I am in need of info on the
little rush box.

The circuit is out of a CQ article by Dave Ingram where he showed a
little 1 tube Xtal Tx and a 3A4 regen set along with a bottle of Tobasco
(tm) sauce as the lead graphic. 

My little regen does not have a smooth regen action. Volume is very low
and tuning range is limited. Somewhere I thought I saw a post about this
circuit and the author said that Ingram's coil data was all
wrong...especially the tickler....it should only be 3 or 4 turns. Just
enuff to get the thing to go into regeneration.

Also, I want to rewind the main coil, and have come up with an inductive
value of 4.3 microhenrys (using a 10-120 pf variable cap) to cover 3.5
mc (GOD! it feels soooooo good to say megacycles instead of HERTZ -
YUCK!).

Do any of the old HBs have wire size vs. turns per inch data that will
give me an idea of how many turns on a 1 inch coil form to wind this
coil?

Ingram says (in his article) that 9 -18 volts is all you need on the
plate of the 3A4. I started with 45 volts and went up to 90 volts and at
90 volts it works pretty good, condisdering all the tuning range where I
hear anything on is only about 1./8 of a turn on the dial!

All I wanna do is get this little jewel working along with a small 1 toob
transmitter to say that I have a early novice rig on the air!

(Boatanchor Bob, where are you?!?!?)
73 rich K7YHA

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

Date: Thu, 31 Oct 1996 03:04:53 PST
From: [email-masked] (Richard H. Arland)
To: [email-masked]
Cc: [email-masked]
Subject: Re: Glowbugs admin ... please read.
Message-ID: <[email-masked]>

Conard & Gang:

My name is Rich Arland and the call is (for now) K7YHA. I am expecting a
"real" 1 X 2 extra class call in the next few days (according to Rick
Lindquist, KF4V, at League HQ the FCC is about the release the Gate 2
vanity calls in the next day or so). 

My main interest up until August this year was QRP. I have authored 3 books on low power communications and done 3 feature articles for QST
(cooberated on a 4th), and a two piece for CQ. I was a contributing
editor for Worldradio magazine for 9 years: 7 as the QRP Guru and 2 as
the SPACECOM weenie.

Since coming back from a Zuni Loop QRP Mountain Expeditionary Force Field
Day in S. California, I have changed directions and am now doing
boatanchors exclusively. The QRP station radios (a Wilderness Sierra
(with the KC-2 readout/keyer/power - S-meter) and the NC-40A) are in a
box in the basement....where they will remain until FD '97.

I have restored a Hallicrafters SX-140/HT-40/HA-1 station, two Hammarlund
HQ-170ACs, a Halli SX-71 (most recently...note the loss of cranial hair),
a Knightkit TR-108 2 mtr AM rig and just procured the matching TR-106 6
mtr rig. Going to try some 2 and 6 mtr AM and CW. Mite even try using
the TR-108 as a RS-10 Mode A uplink transmitter....just gotta key the
buffer. Have a pair of general coverage Heathkits from 1961: GR-81
superregen & a GR-91 5 tube superhet also working. A partially completed
GR-78 portable SW receiver by Heath is still on the workbench....one of these days....  A B&W 5100B AM TX and two Heath SB/HW series transceivers
are two projects also in the "one of these days" catagory.

I have a Halli SX-117/HT-44/PS-150 station coming in in a week or two.
Both of these rigs work, so this won't be a restoration, just a
"plub-and-play" BA station. The pair will be my main HFstation. Still
looking for a HT-45 LOUDENBOOMER 500 watt desk top linear (to cosmetically match my HT-44/SX-117 station, of course!).

My current restoration project is a Halli S-51 (VLF to 12 mc) receiver.
This receiver I'm planning on using to track VLF lightening events and
D-layer density measurements as part of a Society of Amateur Radio Astronomers project.

I have resurected my 3A4 regen receiver and am trying to get it to
work....despite Dave Ingram's article....I want to team that up with a
little 1 tube tx for some fun on the Novice bands.

73 rich K7YHA

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

Date: Thu, 31 Oct 96 20:48:36 AES
From: [email-masked] (Murray Kelly)
To: [email-masked]
Subject: tubes
Message-ID: <[email-masked]>

Subject: 6AE8/X77 tube

>I have here a dozen of what I thought were 6EA8 tubes to substitute for the 
>6U8s in my KWM2-A because 6U8s have been a pain over the years. So I replaced

>6AE8/X77. Does anyone know what this tube is for. I can't find it in any of my 
>manuals. The tubes were manufactured by AWV (RCA affiliate in Australia) so 
>they may be some British type. 
>73 de Dave KI6QE/7

Dave,
I have looked at my books here and the scene is confusing.
The 6U8 is, as you know, a medium u triode/RF pentode
The 6AE8 is a triode/hexode. An equivalent given is the X79
Both of these are noval based,

The X77 is a heptode with a 7 pin base. An american  equivalent given
as a 6BE6.

I hope this helps you - it doesn't do much for me!

Bob Keys - can't find a 1229 anywhere.

Cheers.

Murray Kelly vk4aok

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

Date: Thu, 31 Oct 1996 05:26:54 +0000
From: "Brian Carling" <[email-masked]>
To: [email-masked]
Subject: COnnector needed
Message-ID: <[email-masked]>

Hello guys:
I need a 12 pin Cinch-Jones connecter FEMALE, Cable end.
This is the P.S. connector used on the old WRL DUO-BANDER 84 rig I
have acquired.

I have a bunch of other old BA parts I
could trade for it or whatever.

Any help or leads would be appreciated.

Please e-mail me at  [email-masked]

73 de Bry - G3XLQ / W4  &  AF4K
73 from Radio AF4K / G3XLQ in Gaithersburg, MD USA
[email-masked]
*** See the great ham radio resources at: 
http://www.mnsinc.com/bry/

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

Date: Thu, 31 Oct 1996 05:26:54 +0000
From: "Brian Carling" <[email-masked]>
To: [email-masked]
Subject: Schematic/manual photocopy needed
Message-ID: <[email-masked]>

Hello guys -
I need a photocopy and/or manual for a WRL Duobander 84 rig.
I will pay the usual copying/postage expenses if anyone can help me 
out.

Please e-mail me at:  [email-masked]

Thanks - AF4K / G3XLQ
Bry
73 from Radio AF4K / G3XLQ in Gaithersburg, MD USA
[email-masked]
*** See the great ham radio resources at: 
http://www.mnsinc.com/bry/

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

Date: Thu, 31 Oct 96 07:06:00 CST
From: [email-masked] (Daniel Wright)
To: [email-masked]
Subject: Thordarson Transformer Info Sheet
Message-ID: <[email-masked]>

Greetings!

Whilst diggin' in the bottom of a box of recently aquired 
jun....k...'er...I mean goodies,I found a Thordarson Meissner
Operating Data Sheet for some of their power transformers.
To qoute the sheet: "The following chart gives color codes
and voltage/current ratings of the THORDARSON Universal
Power Transformer line."...etc. If this seems like it might
be useful information, I would be happy to send a photocopy
to anyone sending me an SASE. Thanks.....

Mi info es:

Dan Wright 
1924 S. 77th St.
Lincoln,Nebraska
68506-1805

Take care....

73 de Dan -- WA0JRD ..
[email-masked]

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

Date: Thu, 31 Oct 1996 13:47:52 +0000
From: "Edward A. Stagl" <edstagl>
To: [email-masked]
Subject: Tnx for Absolution
Message-ID: <19961031134749.AAA18782@LOCALNAME>

At 08:09 PM 10/28/96 +0000, you wrote:
>At 05:55 PM 10/27/96 -0600, you wrote: 
>
>..   more recently, 
>>a solid state QRP transceiver ( sorry for the 2 counts of blasphemy )...
>>that produced a few thrills of it's own !!
>>
>>Now, in atonement, I'm starting to rebuild a Knight T-60 transmitter.
>
>You are forgiven of all you sins.  
>
>In further atonement, you will keep the group posted as to your progress,
>accept all offers of parts, information, and advice, and put the thing on
>the air whenever you get around to it.
>
>Go in peace.
> 
>(and whatever you do, Keep em glowing!)
>
>-- Roy Morgan/Building 820, Room 562/Gaithersburg  MD 20899
>(National Institute of Standards and Technology,  formerly NBS)
>301-975-3254 Fax: 301-948-6213  [email-masked] --

Thanks for your absolution ( Fr.) Roy !!  I hope I can further resist the
temptation of answering a QNI from a QRP net with 100 mw ( or LESS )
..and for naught but a scrap of paper !!  But with help from the group and
those like Jeff  kg7jf  and Steve  wa0bpu  I'll have the T-60 up and
glowing in no time.  

Rich  k74ha has posted acknowledgement for your absolution also.
I wonder what sins he has committed ??  ( 72.5 ?? )

73   Ed  N2GVS  

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

Date: Thu, 31 Oct 1996 16:15:00 -0800 (PST)
From: Rossi Giuseppe <[email-masked]>
To: "[email-masked]'" <[email-masked]>
Subject: input tuning of 4cx250
Message-ID: <[email-masked]>

hello everyone

I'm trying to build a linear tube
amlifier with a couple of 4cx250 for 2 meter
band.
The tubes, feeded on the grid, are coupled in parallel, and
i have a question about the input
tuning circut:

I 've seen a project in which the
autor tune the input circuit
by a lambda/2 long "microstrip", directly
connected at the tube side on the grid,
while at the front end side there is a shunt
cap.

The question is : since the metal strip has a noticeable physical length
more than 40 cm ( exactly 44cm) and i wish to avoid that strip (   
otherwise
the aplifier is to cumbersome )

can anyone explain me why to use a lambda/2 line ?
A lambda/2 line doesn't transfor the input impedance, so why to use it ?
what about of using a line with a dielectric ( e.g. teflon ) ?

thank you
iw1clx, Giuseppe Rossi

email [email-masked]

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End of GLOWBUGS Digest 337
**************************