[Boatanchors] Johnson Viking II Audio Mod Question

[Al Parker]

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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