[Johnson] Bigger ain't better

[Kenneth D. Grimm, K4XL]

----- Original Message ----- 
From: "skip" <k3cc@fast.net>


> Hello fellow  Johnsonites,
>
> I replaced my 330 and 150 uf cap in the Viking Valiant today and they
still
> heat up.  I used A2 type ceramic 5000v units.
>
> I don't believe that the cap's are the problem.  Maybe I'm in the
dark, but
> the clamp tube 6AQ5 doesn't seem to be warm.  The filaments are lit.
Like
> the lights on but nobody's home.
>
> Just before the cap's smokes the plate current went full scale.  This
could
> be from the cap shorting out.


Does this happen only when the rig is keyed and drawing normal plate
current or in standby?  If it happens in standby, then your clamper
circuit would be very suspect.  If it only happens when the rig is
keyed, it could be the caps or, as kwylow zinjanthropus suggested, a
parasitic.  I'm not a Valiant expert, but in some rigs the version of
6146 used can make a big difference.  The manual calls for plain 6146's.
You don't happen to have 6146B's in there do you?

Good luck with your trouble shooting.

73,
Ken K4XL
k4xl@arrl.net
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