[HAM] Newbie with M111 Vibrato problem

[Ray Winkel]

I have an M111a and had a similar problem.  1st thing to try is swap the
6AU6s.  One of them
is the preamp pentode for the vibrato channel.  The other is for the
non-vibrato channel.  If the
problem moves to the non-vibrato chanel, it's a bad tube.

That didn't work for mine. :-)

Measure the voltages on V1 (6AU6).  The plate voltage should be 170-200 V.
If it is less than that,
Replace R9 (plate resistor).  If it's more than that, measure the voltage on
pin 6 of the tube.  It should
be about 50 V.  If it's less than that, replace R10. (that fixed mine).  If
it's alot more, replace R11.

If that doesn't work, try something else.  ;-)




On 8/10/06, WHITE, JAMES P <JWHITE3 at entergy.com> wrote:
>
> Hi Group,
> Bought my first organ Friday, a Hammond M-111 - Now the quest is on to
> learn to play.  I have hired a teacher and lessons start tomorrow!
>
> On to my issue - the upper manual plays well with the "Vibrato OFF" tab
> selected (in the down position) but has very low volume with the tab in
> the UP position.  I *think* the same problem exists with the lower
> manual.  To compound matters I don't even know what Vibrato means.
> Maybe it's code for "silence"?
>
> BTW I have basic vacuum-tube technology repair skills due to my hobby of
> restoring antique jukeboxes...  All I've done so far is blow out the
> dust and oil the generator (and make random noises)
>
> Thanks,
> JP White
> Hammond, LA
>
>
>
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