Subject: glowbugs V1 #209
glowbugs Monday, December 22 1997 Volume 01 : Number 209
Date: Fri, 19 Dec 1997 04:40:21 +0000
From: Sandy W5TVW <ebjr@worldnet.att.net>
Subject: RE: AES "sale sheet"
Anyone comtemplating building a junk box transmitter, now is
the time to get the tubes.
"AC-DC" push-pull oscillator tubes:17GV5, 21JV6, 21KQ6, all at 50 cents
each. 15CW5 (nice oscillator driver) at 50 cents each. For some POWER
or a linear amplifier 31LZ6 (30 watt plate dissipation jugs) at $2.50 each.
I'm kinda thinking about using a 21KA6 as an oscillator to drive maybe
two 31LZ6's in parallel and trying to develop over 100 watts output from
a line-operated voltage doubling power supply. Small, light, no transformers.
73,
E. V. Sandy Blaize, W5TVW
"Boat Anchors collected, restored, repaired, traded and used!"
417 Ridgewood Drive
Metairie, LA., 70001
**860 Hartley 'ECO' under construction****
*** Looking for a TRC-10 transceiver ******
*** Looking for an RAL receiver ***********
Date: Fri, 19 Dec 1997 13:08:52 -0600
From: "Freeberg, Scott (STP)" <scott.freeberg@guidant.com>
Subject: Conard, did it work? TEST, DO NOT READ
Conard, I tried duplicating your Outlook settings. Did I get rid of
the attachment?
73, Scott WA9WFA Saint Paul Minn
Date: Fri, 19 Dec 1997 15:54:06 -0500
From: Roy Morgan <morgan@speckle.ncsl.nist.gov>
Subject: Re: Hartley or TNT Tube Candidate?
At 12:10 PM 12/17/97 -0500, rdkeys@csemail.cropsci.ncsu.edu wrote:
>>
>> I have acquired several NOS JAN 6080WB tubes.
... There is a 6583 or something like that that is an equivalent
>to the 6336, but with a different mu,
Here is some info about these tubes:
Type Filament Pd MAX Ep MAX Ip Mu
(values for ONE section: per plate)
6AS7 6.3v @ 2.5a 14 w 275 v 125 ma 1.4 to 2.6
6080 6.3v @ 2.5a 13 w 250 v 125 ma 2
6080WA (same as for 6080)
6082 26.5 v 0.6 a filament, otherwise same as 6080
5998 6.3v @ 2.4a 250 v 125 ma
6336A 6.3v @ 5amps 30 w 400 v 400 ma 2.7
6394A 26.5v@ 1.3 a 30 w 400 v 400 ma 2.7
6528 (same envelope and graphite plate structure as the 6336 and 6394)
Notes: 1) I do not have much data on the 5998, and none on the 6528, but I
suspect that the 5998 is the higher mu version of the 6AS7/6080, and that
the 6528 is the corresponding higher-mu version of the 6336A. I do have
one or two examples of each of the 5998 and 6528, but have not tested them.
2) An RCA publication I have says about the 6080: "Low MU Twin
Triode. Similar to the 6AS7-G, but smaller in size. Intended for
applications crticial as to shock and vibration, and requiring reduced
suscetibility to electrolysis. Octal 8-pin base."
I assume that "electrolysis" means cathode interface or degradation in the
cathode structure caused by long off times, resulting in apparent
resistance and capacitance in series with the cathode. I do know that the
6080 was used in tube digial computers.
3) A 1958 Tung Sol data sheet on the 6336A includes the following
(summarized):
"...Long life, mechanically ruggedized ... Zirconium coated graphite anodes
that ... remain warp free during life and provide one of the best gas
"gettering" means known. .. ceramic insulators, hard glass ... massive
cathodes provide adequate mission current reserve ... gold plated
molybdenum wires in rugged grid structure, tube mount supported from the
bulb by flexible metal vibration snubbers. In many circuits, one 6336A has
replaced two or three tube type 6080WA or 6AS7G regulator tubes. ... A
thirty second warm up time is recommended before plate voltage is applied..."
Keep em Glowing!
Roy, K1LKY since 1959
- -- Roy Morgan/Building 820, Room 562/Gaithersburg MD 20899
National Institute of Standards and Technology
301-975-3254 Fax: 301-948-6213 morgan@speckle.ncsl.nist.gov --
Date: Fri, 19 Dec 1997 16:04:33 -0500 (EST)
From: lee1@digital.net
Subject: wtb 2meter rig
Hi Gang and Merry christmass to all
Boy I finally found an advantage of being old,
your family can not think of anything you need for xmas
so they tell you they will send money.
With money you can buy a nice 2meter fm rig
and that is just what I am looking for.
Something I can put in my car or with a 12v.
supply use as a base station at home.
Nothing big or fancy and dont need a lot of power just want
to be able to get out locally with a half way decent ant.
So if any of you have a rig you want to sell let me know,
if it is a ba more the better as long as you can supply
the schematic or book that came with it.
If it is not a ba well so be, it am still interested.
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: Mon, 22 Dec 1997 05:01:52 -0700 (MST)
From: Jack Meadows <jackmead@getnet.com>
Subject: 813 xtal osc. (update)
Hi gang,
Last night I soldered in the last component and ran the smoke test.
No smoke and 100 watts output with a 3.579 whimpy crystal! Ok, now
the fun begins...a tweak here, a tweak there...shape the keying, ect.
The only problem so far is that it doesn't want to turn off sometimes
after its keyed. I'm using screen grid keying...maybe need to apply
some negative bias to turn it off. It really wants to oscillate.
Need to optimize the pi network values some. Also, going to play with
bending the xtal freq (VXO).
I have small lamps for plate current, grid current and xtal current. It
is fun to tune for max output for the minimum crystal current. This
is a real glowbuggers delight...fiddely.
I'll have it on the 3.579 Mhz glowbug/boatanchors hangout, if all goes
well.
So, how are your Hartley, push pull tx, xtal osc. projects going? I sure
enjoy hearing about them.
Best regards,
Jack W7QQQ
End of glowbugs V1 #209
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