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Category Archives: Service Info


Hammond Generator Start Motor

HammondStartMotor

General Description

This is a shaded pole induction motor used for starting the generator

If your organ is having trouble starting you might suspect this motor. Be sure to eliminate other […]



Console Start and Run Switch Wiring

General Description

From Service Manual

When the organ is started, the starting switch is turned on and held for about "8" seconds while the starting motor brings the system up […]



Service Manual – The Hammond Vibrato

The Hammond Vibrato

Hammond Organ consoles equipped with vibrato differ from tremulant models in the omission of the tremulant switch, tremulant control, and non-vibrato preamplifier, and in the addition of […]



Servicing the Hammond Vibrato Scanner

scannerpic1

CONTENTS:

Scanner Operation.
Vibrato Problems.
Servicing the Scanner.
Assembly
Quick Fix
Disclaimer

Scanner Operation.

Hammond Vibrato Scanner

From Service Manual

Due to the fact that the Hammond Tone Generator runs […]



Servicing the Leslie 147 Amplifier

CONTENTS:

Checking the Cathode Voltage for the 6550A Output Tubes.
Checking the Power Supply Voltages.
Checking the Regulator.
Preamp Tube Voltages.
Last minute Tips.
Distortion.
147 Switching
Discalimer

NOTICE: Very […]



Servicing the Leslie 122 Amplifier

CONTENTS:

Checking the Cathode Voltage for the 6550A Output Tubes.
Checking the Power Supply Voltages.
Checking the Regulator.
Preamp Tube Voltages.
Last minute Tips.
Distortion.
122 Switching
Discalimer

NOTICE: Very HIGH […]



Servicing the Leslie Motors

CONTENTS:

Servicing the Fast Motors
Servicing the Slow Motors
Putting it All Together
Adjusting the Lower Belt
Motor Oiling
Disclaimer

Remember to keep your motors clean and well oiled.

Servicing […]



The Hammond Story

"Fifty years of musical excellence."
from a 50th Anniversary Hammond Co. pamphlet

The Hammond Organ story began in a loft over an Evanston grocery store, for it was there, even […]



Hammond Patent Drawings

Here are the original 17 drawings from the 1934 Patent Office for the Hammond Organ from Laurens Hammond.

 

 

 

 

 

 

 

 

 

 

 

 



Leslie Patent Drawings

Here are the original Leslie Speaker drawings from the 1945 Patent Office.