Re: Name that mod

["Scylla A. Charybdis" <scylla@surfari.net>]

Just a guess...


Someone probably wanted to mix and jazz up to sound on the drawbar assembly, by 
mixing the harmonics to the liking of their own ear.  Producing some different 
(wierd) sounds by bringing the potential of the higher harmonics to a level 
something like the lower harmonics, whereas the upper harmonics have rolloff.


At 02:30 PM 2/1/97 -0800, you wrote:

>I just got a BCV console this week and it's in great shape.  Only thing 

>wrong with it was someone had improperly added some strange modification.

>

>It's controls are mounted in place of the wood block at the left end of 

>upper manual.  It is unlabeled, but has six small on-off type switches

>and two knobs.

>

>Inside the organ it was wired to six drawbars.  An AC tap was taken 

>from the power terminal strip and wired to a small transformer, whose 

>output led to a series of capacitors then connecting to the module.

>

>This device added different harmonics with the panel controls engaged.

>Unfortunately, the upper six drawbars on the upper manual's B preset

>were reversed.  Pulling the fourth drawbar provided the ninth drawbar's

>harmonic and vice versa, etc.

>

>I reversed the solder connections that fed each of the six affected 

>drawbars from the mod via tiny gauge wires like phone wire.  This 

>corrected my drawbar problem.  However, a loud 60Hz hum was produced.

>I couldn't find any bad ground connections.  Touching the control panel

>on the mod changed the hum.  

>

>I guess the whole thing was wired backwards.  Even the two volume knobs

>got louder when turning COUNTER-clockwise.

>

>I went in and disconnected the unit's AC power supply.  This seemed to 

>restore everything to normal.  Except if I turn up the mod's volume 

>knobs, some noise is audible.  I just leave them off and all's OK.

>I probably should eventually either fix the thing or remove it.

>

>Anybody have any clues about this thing?

>

>Thanks.

>Phil Clements

>Massachusetts

>

>

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