YORE: [HAM] What would happen

[William Mark Bristow]

JD,
Are you trying to figure out which outlet you have on the B3?  (WARNING:  IF
YOU'RE UNSURE AS TO ANY INFO HERE - HAVE A QUALIFIED ORGAN TECH LOOK AT WHAT
YOU WANT TO HOOKUP!!!  I take no responsibility for damage resulting from
the information provided here.  Proceed at your own risk!)  (PS:  The info
here is gleaned form Uncle Harvey's Leslie Pinout guide on
www.captain-foldback.com)

Usually older B3's have a standard Hammond Tone Cabinet hookup - either 5 or
6 pin.  If you'll look carefully at the Amphenol 5 or 6 pin connectors they
are clearly marked, and you should be able to trace the wiring colors up to
the preamp.
On a Hammond Tone Cabinet or a 122 the pins are
1) Black - Signal (Balanced)
2) Yellow - Ground
3) Gray - AC
4) Blue - AC
5) B+ (approx 300 volts DC)
6) Red - Signal (Balanced)

On a Five Pin (Organ) to Six Pin (Leslie) Hookup the 5 pin is
1) Black - Signal (Balanced)
2) Gray - AC
3) Shield - Ground
4) Blue - AC
5) Red - Signal (Balanced)

This connects through the regular Leslie Cable to the Six pin (above) on the
Leslie - with a 5 pin at the organ there is no connection for the Yellow -
B+.

A 122 Leslie CAN plug into either of the above, providing you have the
appropriate cord - however without either an older Model 8000 Kit or a
modern 6122 kit to connect the speaker (additional wiring and components
installed in the organ with the fast/slow switch) - the Leslie will only run
on FAST -.  The Kit takes either 300 volts (B+) DC from the organ preamp, or
the B+ (Pin 5) on the 6 pin Leslie cable and divides it down to about 70-80
volts and applies it through an isolation transformer to the 1 & 6 pin of
the 6 pin, or the 1 & 5 pin of the 5 pin.  That voltage is picked up at the
122 Leslie by one of the 12AU7 tubes and is used to switch the relay to
SLOW.

A 147 Leslie is wired
1) Black - Signal Ground (Unbalanced)
2) Yellow - Tremolo AC relay control (This is 120 volts AC)
3) Gray - AC power in
4) Blue - AC power in
5) Brown - Tremolo AC relay control ( This is 120 volts AC)
6) Red - Signal (Unbalanced)

On a 147 the fast/slow organ mounted switch uses 120 volts AC to switch on
an AC relay in the Leslie which controls fast/slow.

Though the plugs and cables are identical for a 122 and 147 THEY ARE WIRED
VERY DIFFERENTLY with 120 VOLTS AC on PINS 2 & 5 when the organ expects DC
voltage on 5 and ground on 2.  You could fry both the organ preamp and the
Leslie amplifier.  A new 122 or 147 Leslie Amp is about $550.00, and there
are no new preamps for the organ - so you'd have to find a rebuilt or used.

A $45.00 to $100.00 Organ Tech service call to hook the Leslie up (plus the
kit price if needed) is much cheaper than experimentation here.
Good luck,
Mark

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