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Category Archives: Service Info


Church Sound Systems

Church_Sound_Systems

While servicing Church Organs and Digital Pianos I am frequently being asked about Church Sound Systems. Since I have been around sound systems for years and have played in professional bands […]



Working with the Worship Team

Working_with_the_Worship_Team

First of all I have over 30 years of experience playing in a band or group setting with other musicians. I have led Worship and currently play in a church […]



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 […]