[Boatanchors] JOHNSON MODEL 122 VFO RE-CAP

[cemilton at aol.com]

Ed and group,

I don't own the 122 anymore, but I recall there was one resistor that 
was underrated at 2w and that should be upgraded to a 5w or 10w size.  
No longer have the schematics, so I can't be specific.  If you're 
replacing caps, pay particular attention the the NP0 ones if they are 
replaced.  It's possible to get the dial tracking out of whack and 
possibly out of range for adjustment.  I recall my 122 was stable after 
10-15 minutes of warmup.  I used it with the Viking II and with great 
success.  Nice VFO.

YMMV.

73 de W4MIL
Chuck



-----Original Message-----
From: k9ew57 at gmail.com
To: johnson at mailman.qth.net; Boatanchors at mailman.qth.net
Sent: Sun, 18 Mar 2007 9:53 AM
Subject: [Boatanchors] JOHNSON MODEL 122 VFO RE-CAP

  Has anyone done a re-cap on a Johnson Viking Model 122 VFO? Mine is
 working, but unstable, drifts, and has a mild chirp. Other than that,
 it's working fb.

 I've already cleaned the Bandswitch and variable capacitor grounds
 with De-Oxit, which helped quite a bit. I think the instability might
 be fixed by re-establishing good chassis grounds. Not sure about
 fixing the mild chirp - that may come from the voltage regulator. I
 suspect the drift can be fixed or improved with the addition of the
 appropriate capacitors.

 Any references or suggestions would be appreciated.

 Tnx es 73,
 ed - k9ew
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