[AMRadio] More Viking 2 news


Ellen Rugowski ellenjoanne2003 at sbcglobal.net
Sat Feb 23 12:36:41 EST 2008


Oops!  Sorry, I forgot to respond off list.

Ellen - AF9J

----- Original Message ----- 
From: "Brett Gazdzinski" <Brett.Gazdzinski at verizon.net>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Saturday, February 23, 2008 9:23 AM
Subject: Re: [AMRadio] More Viking 2 news


> Ellen,
> I think I can give you a bunch of 807's, I don't and would not use
> them anymore, I go with KT88's or KT 90 tubes as modulators.
>
> So, I likely have a crap load of 807's (and 1625's).
>
> Send me your mailing address and I will get what I have out
> to you.
>
> You should check the screen and bias voltages at the tube sockets to be
> sure they are ok.
> Resistors in most applications can be off 20% without causing any
problems.
>
> Brett
> N2DTS
>
> ----- Original Message ----- 
> From: "Ellen Rugowski" <ellenjoanne2003 at sbcglobal.net>
> To: <amradio at mailman.qth.net>
> Sent: Friday, February 22, 2008 11:42 PM
> Subject: [AMRadio] More Viking 2 news
>
>
> > Hi Everybody,
> >
> > Work's been kind of nuts lately, and I've been pretty burned out.  So,
> > I've
> > only been able to work on my Viking II sporadically.  Last Sunday night,
I
> > finally got around to wiring up my D-104 with the mic connecter Ed,
VA3ES
> > sent me, for use with my Viking II.  With the mic finally wired up, I
was
> > able to determine that yes, my Viking 2 is wired up for PTT (the PTT in
> > mine
> > works fine). I also was getting OK modulation of of my Viking.  BUT,
after
> > no more than about 5 seconds of mic keydown, the modulator current would
> > surge, and start to run away.  Well, due to the fiasco the CQ 160m
Contest
> > is turning out to be for me, I decided to work on my Viking 2's
modulator
> > issue.
> >
> > Well, it looks like I found my problem in spades. After only about 2 or
3
> > seconds of mic keydown, in spite of the fact that I had the mic
gain/audio
> > level at zero, the modulator current surged again.  I unkeyed the mic,
let
> > things settle down, and keyed up the mic again, watching the 807s.  Sure
> > enough, the modulator current surged again, and when it was happening,
> > what
> > did I see? - a nice BIG arc over between the plate and the grids on one
of
> > the 807s!  I shut things down, pulled the 807 out that arced, fired up
the
> > my Viking 2 again, and keyed the mic, with only the non-arcing 807
> > installed.  Nothing happened, other than the fact that the modulator
> > current
> > stayed
> > steady at a pretty low level (due to there only being one 807
installed).
> > So, it looks like I need to buy another 807. And maybe, it might
> > be wise for me to get two of them, and save the one remaining good one
> > have
> > at the present, for a spare. BTW, the resistor on the plate cap for the
> > bad
> > 807 is supposed to read 22 ohms. Assuming that's it's your typical
+/-10%
> > resistor (personally I prefer +/- 5% or better), it shouldn't read more
> > than
> > say 25 ohms.  The cap resistor on the bad 807 read 28 ohms.  Well, there
> > isn't much more I can do with the Viking 2, until I get the new 807s.  I
> > don't feel like pulling off the mic connector I installed for the Viking
2
> > (wiring up mic connectors is a pain), and I haven't gotten the mating
> > connector yet, that I need to wire up an adapter cable, so I'm out of
luck
> > with using the Scout for tomorrow's Midwest Classic net.  I'll only be
> > able
> > to listen to Rob, run the net.  Well, I think I'm going to call it a
> > night,
> > I'm falling asleep.
> >
> > 73,
> > Ellen - AF9J
> >
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