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Category Archives: Hammond Organ


Servicing the Hammond B-3 Type Pre-Amp

ao28

CONTENTS:

General Description
Input Stages
Volume Control Section
Output Section
Percussion
Vibrato
Final Thoughts
Disclaimer

AO28 Layout
AO28 Schematic

General Description
The AO-28 tube pre-amp is found in the Hammond […]



Hammond Percussion Quick Fix

Due to age and materials used in Hammond Organs, a common problem is the growth of tiny metallic hairs on metal surfaces. These hairs can shunt signals to ground causing […]



Servicing the Hammond B-2/C-2 Type Pre-Amp

ao10a

CONTENTS:

General Description
Input Stages
Volume Control Section
Output Section
Vibrato
Final Thoughts
Disclaimer

AO10 Layout

AO10 Schematic
General Description
The AO-10 tube pre-amp is found in the Hammond B-2 […]



Servicing the Hammond Tone Generator

generator

CONTENTS:

Technical Description
Run Motor
Start Motor
Start and Run Switch Wiring
Tone Wheels
Pickup Coils and Magnets
Generator Filters
Disclaimer

Technical Description

From Service Manual

Each Hammond Organ Console […]



Hammond Generator Filters

filtergroup

General Description

From the Service Manual 

As a means of eliminating any vagrant harmonics that may be present, there are filters consisting of small transformers and condensers associated with certain […]



Generator Pick-Ups

generator

General Description

From Service Manual.
Associated with each tone wheel is a magnetized rod about 1/2 inch in diameter and 4 inches in length, with a coil of wire wound […]



Tone Wheels

tonewheelfig

General Description

From Service Manual.

Each tone wheel is a steel disc about two inches in diameter, accurately machined with a definite number of high and low points on it's […]



Hammond Synchronous Run Motor

runmotor

General Description

The run motor is a non-self-starting synchronous motor. Rather than delivering a constant power, it delivers a series of pulsations, one for every half cycle. That would be […]



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 […]