+However, the 147 hookup is relatively simple and requires only minimal technical expertise.
+
+This hook-up is intended for Hammond tonewheel consoles with
+ # Balanced (a.k.a. push-pull or [G-G]) outputs
+ # A self-powered preamp (with a power transformer and 6X5 or 6X4 rectifier tube)
+ # No built-in power amplifier and speakers
+
+Except for the D-100 series
+(which is essentially a Model RT-3 with the components from a PR-40 tone cabinet
+installed in the organ),
+Hammond console organs with built-in power amplifiers like the A-100 series can
+drive 147-type Leslies directly from the speaker outputs.
+In this case, one of several standard Leslie connector kits can be used and a
+custom hookup is not required.
+
+Included *Hammond* models are: B2, B3, C2, C3, D-100 Series, RT-2, and RT-3.
+Early Hammond models like the A, BC, CV, D, RT, etc. are not self-powered and
+require DC (B+) from a Hammond tone cabinet or Hammond-type Leslie to power the preamp. "Non-Hammond" Leslies have no provision to supply this power but can be used with
+early consoles if a separate DC source is provided.
+
+Included *Leslie* models are: 31W, 44W, 45, 46W, 47, 47R, 145, 145A,
+147, 147V, 147RV, 245, 247, 247RV, 147A, and 147A-T.
+(Models 25, 125, and 225 with power amps are electrically compatible but
+don't have rotary treble horns and are not recommended for console organs.)
+
+*NOTE*: Do not rewire the organ's stock 5-pin tone cabinet socket
+for 147-type Leslies or use a 5-to-6 pin Hammond cable for this purpose!
+Doing so could result in a serious electrical hazard.
+Universal-type Leslies require a separate 6-pin socket,
+_which should be labeled_ "147" or similar.
+Caution users not to use this socket for Hammond tone cabinets or Hammond-type Leslies.
+If the organ is also equipped with an 8000 or similar Hammond-type connector kit,
+be sure that the signal feed is kept separate from the 147 hookup.
+147-type Leslie models have no provision to isolate the DC control voltage
+used in Hammond-type hookups.
+
+For temporary use,
+it's possible to remove the six-pin plug from a six conductor Leslie cable
+and make the following connections directly to the organ's preamp.
+However, this type of hook-up should not be used for portable or permanent use.
+The installation will be neater and safer if the six-pin socket is installed
+in the organ's outlet box.
+
+
+
+Pin Num
+Wire Color
+
+Function
+Connection
+ 1
+Black
+Signal Ground
+Connect to the preamp chassis or preamp ground terminal. (This is the brown wire next to the two "G-G" terminals on later preamps.)
+
+ 2
+Yellow
+Tremolo Relay Coil
+Connect a SPST switch between pins 2 & 3 to control the rotor motors. (This sends mains voltage to the AC relay coil.)
+
+ 3
+Blue
+120 VAC.
+Connect pin 3 to the blue AC input terminal on the organ preamp chassis.
+
+
+ 4
+Gray
+120 VAC
+Connect pin 4 to the gray AC input terminal on the organ preamp chassis.
+
+ 5
+Brown
+Tremolo Relay Coil
+Connect pin 5 to pin 4. (This completes the circuit to the relay coil.)
+
+ 6
+Red
+Signal Input
+Signal Input. Connect pin 6 to either the red or black "G" terminal (but not both!).
+
+
+Set the _LoadSwitch_ in the Leslie power amp to the "open" position.
+This completes the hook-up.
+If a 122-type "half-moon" switch is used, it will work backwards with 147-type Leslies.
+To fix the problem, simply rewire the switch using the previously unused set of terminals.
+(The same switches were used for both 122 and 147 type kits and have two sets of contacts.)
+
+If a Hammond tone cabinet or second Leslie is part of the installation,
+they must be "in phase."
+Two organ speakers close together will have a noticeably uneven pedal response
+if the bass speakers are out of phase.
+Should this happen, move the signal connection from pin 6 to the other "G" terminal.
+
+147-type Leslies are easily added to existing Hammond-Leslie installation with a few precautions.
+There is plenty of signal available but the console's AC wiring can supply power for
+only two tone cabinets.
+If a third speaker is used,
+a power relay should be used to reduce the electrical load on the organ.
+Also, the life of the organ's "run" switch is extended
+if the current load is reduced.
+
+
+Universal-type Leslies should be connected directly the organ preamp.
+If the organ has echo or other signal switching, these should be bypassed.
+Hammond consoles were usually used only with external cabinets with balanced inputs.
+It's possible to devise a switching system for both balanced and unbalanced inputs but the circuit is more complex and beyond the scope of this project.
