HammondWiki - Leslie 147 Hookup

Pinout

Looking into the male connector (as if you were going to plug it into your mouth):

   6         1
      O   O
        *
 5  o       o  2

      o   o
   4         3

Pin 1	Signal (Gnd) [black]
Pin 2	AC to tremolo relay [yellow]
Pin 3	AC power [gray]
Pin 4	AC power [blue]
Pin 5	AC to tremolo relay [brown]
Pin 6	Signal (Hot) [red]

Hooking a Leslie147 to a spinet

Here's a schematic of the LeslieHookupKit I pulled out of a Wurlitzer spinet. It should be enough to give you a good idea of what is involved in hooking a 147 (or other "single-ended" Leslie) to speaker level outputs.

The 26-1 kit is relatively easy to make, even more so if you don't mind having the internal speakers permanently disconnected. The most basic setup requires i) A six pin amphenol socket, ii) a fuse holder with 5A fuse, iii) an electronics hobby box or similar housing and iv) a single pole - single throw switch of your choice capable of handling line AC voltages. Remember that the 1 through 6 pin-out on the socket will be the reverse of that seen above. To avoid confusion count pins 1 through 6 as above while viewing the socket from the rear (where you solder the wires from the organ).

Hooking a Leslie147 to a console

Generally, you should drive the Leslie input off of one of the G-G Outputs and (AO-28 chassis) ground. Reportedly, you can drive the Leslie both G-G outputs for more drive. (Either way, make sure to put the Leslie load resistor switch in the off position.)

Note that in an intact A-100, you can hook the Leslie to either the G-G output(s), or to the speaker level outputs from the AO-39. Beware that there is a high-cut filter in the AO-39, so the signal to the Leslie will tend to be bass-heavy if fed from the amplifier output.

For information on how to wire a MainEnsembleEcho switch to switch between a HammondToneCabinet (or 122-type Leslie) and and 147-type Leslie, see MainEchoSwitchingForA100WithLeslie147.

Included from Connecting147TypeLesliesToOlderHammondConsoleOrgans

This writeup was graciously provided by HarveyOlsen:

Electro Music (and later CBS) did not provide factory kits to connect so-called "universal" or general-purpose Leslies to Hammond console organs without internal speaker systems. This was done to protect Hammond dealers who, at the time were responsible for most of Leslie's sales. Any music dealer could sell 147s and other general-purpose Leslies, but only Hammond dealers sold Hammond-type Leslies like the 21H, 22H, and 122. 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.

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	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.

TopicHookup