HammondWiki - Diff: Connecting147TypeLesliesToOlderHammondConsoleOrgans

@@ -2,11 +2,11 @@

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.

+Any music dealer could sell [147|Leslie147]s and other general-purpose Leslies,

+but only Hammond dealers sold Hammond-type Leslies like the 21H, 22H, and [ 122|Leslie122] .

+However, the [ 147 hookup|Leslie147Hookup] 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)

@@ -48,45 +48,17 @@

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!).

-

+<?plugin OldStyleTable

+| 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 | 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.

@@ -111,4 +83,6 @@

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

Newer page:	version 4	Last edited on March 13, 2003 9:33 am.	by
Older page:	version 2	Last edited on March 13, 2003 8:53 am.	by