RE: Help - B3 Intermittent loss of highs and intermittent hum

[John Bittner <jbitt@primenet.com>]

>My B3 intermittently cuts out, best described as a loss of highs, 
diminished
>volume, and sometimes accomp'd by 60Hz hum (but not the steady "wire 
broken"
>variety).  Audio injected into the "phono" input suffers a similar fate, 
which
>leads me to the conclusion that the problem lies from the 12AX7 - 12BH7 
onward
>including the Leslie 122.  I have replaced/substituted all tubes including
those
>within the Leslie with no relief.
>

The problem is likely a bad capacitor or solder joint in either the preamp 
or Leslie.  If mechanical shock (giving the organ or Leslie a good whack) 
solves the problem it's a solder joint, but I would suspect a capacitor 
based on your start switch remedy.

jb