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The first Hammond-Leslie FAQ was written by BradBaker in 1994. See HammondFaq for pointers to the current FAQ.

From the Preface

Welcome to the Hammond organ and Leslie speaker Frequently Answered Questions: a source of information, myth and lore regarding all things Hammond and Leslie for seasoned elders, new converts, skeptics, and visitors alike. It is hoped that among the fanatical ravings herein will be found real, actual, useful information. The information in this FAQ was collected from various sources, but most of the good stuff came from postings to the Hammond Mailing List (MarkLongosOldMailingList, that is.)

Brad has graciously granted permission to use whatever material we like from his FAQs as seed material for this HammondWiki.

A (rather old) copy of Brad's FAQ is online at:

A newer version (extracted from a postscript version) is at:

Table of Contents

Here's the table of contents of the OriginalHammondLeslieFaq, annotated with links to the sections which have been excerpted into HammondWiki.

  1. Introduction

  2. The Hammond Tone Wheel Organ - WhatIsAHammondOrgan

    1. Hammond Percussion
    2. KeyClick
    3. Hammond Vibrato
    4. The Scanner
    5. Drawbar Registrations


    1. HarmonicFoldback
    2. Obtaining Service or Owners Manuals - ServiceManual
    3. Oiling the Hammond - HammondOil
    4. Caveat Emptor - Buying a Hammond


    1. HOW-TOs: Repairs, Modifications, and Tech Tips

      1. HowToCleanKeyContacts
      2. HowToCleanDrawbarContacts
      3. HowtoAdjustThePreampDriveLevel (B-3/C-3/RT-3/A-100)
      4. HowToRebuildTheVibratoScanner
      5. How to lube the manual busbars - BusbarLubeJob
      6. How to change the percussion keying source (PercussionModifications)
      7. PercussionTroubleshooting
      8. How to eliminate organ volume drop when percussion VOLUME is set to NORMAL - PercussionModifications
  3. The Leslie Tone Cabinet "Pipe Voice of the Electric Organ"

    1. The Basic Configuration - Leslie

      1. The Treble Rotor - Leslie
      2. The Bass Rotor - Leslie
      3. Amplification - Leslie
    2. Leslie Accessories - LeslieComboPreamp
    3. LeslieModifications


    1. LeslieRecordingTechniques
    2. OilingTheLeslie
    3. One-speed to TwoSpeedLeslieConversion
    4. LeslieRotationSpeed
  4. HammondAndLeslieProductionModels
  5. Determining the Age of a Hammond or Leslie

  6. FAQ Contributors

The content of this page is Copyright (C) 2000, 2001, 2002 Geoffrey T. Dairiki and the other authors of the content, whoever they may be.
This is free information and you are welcome redistribute it under certain conditions; see for details.
Absolutely no warrantee is made as to the correctness of the information on this page.