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Robert Conrad, Registered Piano Tuner/Technician, Tucson, AZ

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Conrad Piano Service (520)784-1549
Robert Conrad, Registered Piano Tuner/Technician, Tucson, AZ
Conrad Piano Service (520)784-1549
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  • About Bob Conrad, RPT
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    • What type of piano is it?
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      • The A4 Numbers
      • The “4th” A4 Number
      • The Prime 5ths
      • Balancing the Prime 5ths
      • Mapping A3
      • The Prime Octave’s Mid-Point
      • Mapping A3: Procedures
      • Mapping the Treble with Templates
      • Mapping A1
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    • Piano Manager Articles
      • Video: Creating a Header Sheet for xMem Tunings
      • Video: File Types and Piano Manager
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    • Partial Change Articles
      • Partial Changes & Scaling Issues
      • How to Lower the Tenor Partial Change
      • Why Lower the Tenor Partial Change
      • Using PCC (Partial Change Correction)
    • FAC Tuning TweaksContains articles on FAC Tuning
      • The “A” Multiplier Default
      • Double Octave Beat (DOB)
      • Using a Sequence
      • Custom Over Pull
      • Suggested FAC Tweaking Routine
      • Try a Different “F” Number
      • FAC Tuning Routine Using PCC
      • Add Stretch to the Bass w. PCC
    • Audio Files Tuning “Listens”
    • YouTube Videos
    • Downloads
      • Download Tunings
      • Download Piano Manager Software
    • Accu-Tuner Sales
  • Home
  • Reviews
  • Contact
  • About Bob Conrad, RPT
  • Musical Education
    • Joanne Baker
    • Robert Conrad Senior Recital, May 1, 1979
    • Carl Friedberg
    • Victor Labunski
  • FAQ
    • What type of piano is it?
    • What’s a Registered Piano Technician?
    • How old is my piano?
    • Piano Tuning: How often?
    • What’s Piano Action Regulation?
    • What’s the piano worth?
    • Hygrometer: Analog or Digital?
    • Acoustic or Electric Piano?
    • Will you come to my community?
    • Piano Brands/Manufacturers
    • Piano of Interest: Steingraeber
  • Accu-Tuner Blog
    • Littau-Conrad (LC) Tuning System
      • LC Spreadsheet Preview
      • LC Spreadsheet Demo 2
      • The Tuning’s “Targets”
    • Mapping
      • Templates
      • The Prime Octave
      • The A4 Numbers
      • The “4th” A4 Number
      • The Prime 5ths
      • Balancing the Prime 5ths
      • Mapping A3
      • The Prime Octave’s Mid-Point
      • Mapping A3: Procedures
      • Mapping the Treble with Templates
      • Mapping A1
      • Mapping A0
    • Piano Manager Articles
      • Video: Creating a Header Sheet for xMem Tunings
      • Video: File Types and Piano Manager
      • Excel (Spreadsheet) Tuning Organization
    • Partial Change Articles
      • Partial Changes & Scaling Issues
      • How to Lower the Tenor Partial Change
      • Why Lower the Tenor Partial Change
      • Using PCC (Partial Change Correction)
    • FAC Tuning TweaksContains articles on FAC Tuning
      • The “A” Multiplier Default
      • Double Octave Beat (DOB)
      • Using a Sequence
      • Custom Over Pull
      • Suggested FAC Tweaking Routine
      • Try a Different “F” Number
      • FAC Tuning Routine Using PCC
      • Add Stretch to the Bass w. PCC
    • Audio Files Tuning “Listens”
    • YouTube Videos
    • Downloads
      • Download Tunings
      • Download Piano Manager Software
    • Accu-Tuner Sales

March 31, 2019

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The A4 Numbers

MappingBy BobMarch 31, 2019

The “A4 numbers” are the locations of the 2nd, 4th, and 8th partials  of A4 when A4 is tuned to A440 (1st Partial).

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