[Boatanchors] Johnson Viking II Audio Mod Question

[Bob Peters]

Hi all ...My Viking II has outboard audio all the way and sounds great
on the air from what I am told.
I am using a Hammond Transformer #812 into the grids of the modulator. I
ten feed the 600 ohm input with a Mixer that has a parametric EQ in it.
You can also use the cheap Behrenger mixer...I also have a Comp/Limiter
to limit my negative peaks...I have about 115% positive and 95%
Negative...

Very Best 73's
Bob W1PE
The Voice of Mesquite
www.w1pe.com

"Money is only temporary, but radios are forever" - Jim Little aka "the
old dog"/K5BAI


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Al Parker
Sent: Tuesday, July 10, 2007 10:53 AM
To: Freeberg, Scott (STP); Boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] Johnson Viking II Audio Mod Question


Hi Scott,
    Jusst sent you a .jpg from the following website, that might be it:
http://www.w8ji.com/Johnson%20audio%20mods.htm
    I googled & found a lot of different articles last Spring when I did
my 
Viking 1.  I didn't change tubes, but did replace almost every
component, 
incl. interstage xfmr, and put regulation in there.  Will search up that

skem if you're interested, I like it, get good reports, close to 100% 
modulation.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

----- Original Message ----- 
From: "Freeberg, Scott (STP)" <Scott.Freeberg at guidant.com>
To: <Boatanchors at mailman.qth.net>
Sent: Tuesday, July 10, 2007 11:30 AM
Subject: [Boatanchors] Johnson Viking II Audio Mod Question


I've got a gorgous Viking II with a messed up preamplifer modification. 
I've looked in ER and online Viking II audio mods, found several, but
not 
like the one here.  The PO replaced both 6AU6 preamplifiers with 9 pin 
12AT7s or 12AX7's.  The first 12AT7 provides two stages of amplification

while the 2nd tube has both sections tied in parallel for a massive
driver 
transformer drive.

Does that mod sound familar to anyone.  The circuitry for that mod is a
mess 
with shorts, messy connections, burnt wire insulation, wires tacked on, 
etc..  The rest of the Viking II connections are clean, its just a mess
in 
the preamp section.

I'm thinking of just removing the mess, putting the 7 pin ceramic
sockets 
back in, and putting back to original.

73, Scott WA9WFA _______________________________________________
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