Subject: glowbugs V1 #207
glowbugs         Wednesday, December 17 1997         Volume 01 : Number 207


Date: Tue, 16 Dec 1997 17:39:22 +0100
From: Jan Axing <janax@algonet.se>
Subject: Re: Hartley or TNT Tube Candidate?

Roderick M. Fitz-Randolph wrote:
> 
> I have acquired several NOS JAN 6080WB tubes.  It occurs
> to me that these brutes that have been used typically
> in voltage regulator circuits in Tektronix scopes, etc.,
> are perfect fodder for a husky Hartley, ECO, TNT, or
> whatever.  Anyone have any experience with these in that
> sort of circuit?  Any particular caveats?

They are equivalent with 6AS7 and should suit most applications
like Hartleys and even regennies. Plate dissipation is 13W per
triode and mu is a lowish 2. A low impedance dual triode.
I'll say a 3-4 watter Hartley should be possible to do as well as
a TNT but not an ECO... or is it possible to create an ECO by
cascoding the two triodes?

Jan, SM5GNN



Date: Mon, 15 Dec 1997 23:07:03 -1000
From: Peter Demmer <ampruss@hits.net>
Subject: Re: 813 tube, xtal osc. tx. update

Brian Carling wrote:
> 
> On 15 Dec 97 at 17:43, Jack wrote:
> 
> > Hope it works. If it does, what shall I call her?
> > "Rock Crusher" ?
> 
> Only if you let the grid current run too high, he he!
> 
> ****************************************************
> *** 73 from Radio AF4K/G3XLQ Gaithersburg, MD USA  *
Snip!!!

Or a pile of graphite. If you forget the series 2 vdc pilot light.
Jack,  I wonder what you are going to use for the 50k at 25 watts, Grid
Resistor (R3)?  I paralled (sandwitched between two single sided
prepunched FG/G10 PC boards) ten, 500k ohms rated at 3 watts each, film
resistors.  I kludged up the load to pull 50 mA from 1500 vdc through
the bank.  RCA recommands 45 mA max on SG-2 at 1500 vdc plate. This
circuit is set up to supply 0.030 A or 30 mA.  After 15 minutes, POWER
OFF PLEASE the resistor bank was barely warm.  I used every other hole
in the prepunched PCB grid pattern.  If we start with 1 Meg ohm
resistors and use 20 resistors (same 2 or 3 watt rating)  Peter/KH6CTQ



Date: Wed, 17 Dec 1997 12:10:58 -0500 (EST)
From: rdkeys@csemail.cropsci.ncsu.edu
Subject: Re: Hartley or TNT Tube Candidate?

> 
> I have acquired several NOS JAN 6080WB tubes.  It occurs
> to me that these brutes that have been used typically
> in voltage regulator circuits in Tektronix scopes, etc.,
> are perfect fodder for a husky Hartley, ECO, TNT, or
> whatever.  Anyone have any experience with these in that
> sort of circuit?  Any particular caveats?
> 
> Rod, N5HV
> w5hvv@aeneas.net

6080's will work, but 6AS7G's are better.  In my hands the 6080's as
well as 6336's (even bigger monster) tend to draw very high plate
currents.  The biasing and feedback taps are more critical than with
the 6AS7G.  There is a 6583 or something like that that is an equivalent
to the 6336, but with a different mu, that works quite well in Hartley
service, also.  I use it in my Grammer 1932 Hartley 160M set.  The
classic 6N7 tube should work well, also.

As an aside, I wonder how well these low-mu pass regulator tubes would
work as switches for keying (a la the old '45 keyer tubes).  I would
expect them to work rather well as keyer tubes, but have not tried them
yet.  Barry Ornitz.... you got any thoughts on using these as keyer tubes?

I heard W7FG on with his 211 Hartley a few nights back, and it sounded
pretty good.  Where are all the other Hartleys folks are working on?

Bob/NA4G



Date: Wed, 17 Dec 1997 14:50:17 -0500 (EST)
From: rdkeys@csemail.cropsci.ncsu.edu
Subject: XMAS Greetings from NA4G/BABob

Well, it has been an interesting year, and ol BA Bob has had a good time
with it and the group.  I have learned a lot from the crewe and hopefully
have returned a little in kind.  I was hoping to get a Hartley Ralleye going
over the holidays, but it may be a bit premature.  I will perchance hear a
few of you on new year's eve and new years day with some SKN pumphandlin' on
the ol BA/GB QRG, anytime.

Over the holidays, call CQ BA generally, anytime, and on SKN (New Year's eve
and New Year's day) call CQ SKN BA.  Report back any fine/wierd/interesting
QSO's an' fists de CWIST.  I will try to get a little of everything from
Hartleys and Regenerators to Big Berthas at full steam, on the air so no
tellin' wat ye mighst 'ear on de ol' BA/GB QRG ethers.  Another good place
to listen is on 3535, where other OT's have been known to hang out.

Work on yer Hartleys and other puffers over the holidays, and perchance
we will get enough of them up that we can have a Hartley Ralleye in the
2nd weekend of January, if the creek holds water, and don't rise too much.

Best o' Glowbuggin' in '98, and fer sures keeps yer bottles a'glowin' bright!

73/ZUT DE NA4G/Bob UP

Boatanchor Bob, dat Ol' Greybeardus CW Pfarte......



End of glowbugs V1 #207
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