-----Original Message-----
From: Ellen Rugowski
Hmmm, so the shunts are those two loops on either side of the where the
center tap from T1 feeds onto the terminal strip. I didn't know that. I
thought it was the bridging wire across Postion 4 on the meter function
switch.>
The other shunts are clustered on a terminal strip under chassis
between the 6146 skt plate and the front panel, I think. Don't have the
rig here. They are low value carbon comp and I had to change one that
had drifted. A meter does little good if it's not accurate. The 10 ma
clamp tube adjustment indication is so small
that it would not take much to be inaccurate. The screen dropping
resistor adjustment, the big slide resistor, interacts greatly with the
clamp tube adjustment. I kind of had to go back and forth several times
to get it all right. A VTVM is best for bias measurements as most DMMs
will load high imp circuits especially bias adjustments.
As for the roller inductor - yes that's one of my concerns for
being the smoke generator. If it's going funky, I have no idea if it
can be
repaired. I may have to get one out of a junker.>
I got my replacement roller at a Hamfest quite some time ago. It was
used, not a Johnson but in good condition and exactly the same.
A real pain to replace ! Hopefully you will not have to.
73,
Bill, KB3DKS
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