The Korf Blog
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Thursday, October 17
An Update, and Some Reviews
Friday, May 17
Munich High End 2024
Wednesday, April 10
Life Begins at 100 (Posts)
Tuesday, September 19
Our Audio Priorities
Wednesday, April 26
Moving Coil Transformer Hum—How to Fix
Monday, March 13
What Causes Turntables to Hum?
Tuesday, February 21
Turntable Drives. Part VI, Direct Drive Feedback Loops
Monday, December 12
Turntable Drives. Part V, Direct Drive Torque Ripple
Tuesday, November 22
Turntable Drives. Part IV, Direct Drive Introduction
Tuesday, September 13
Turntable Drives. Part III, Idler Drive and its Problems
Tuesday, August 9
Turntable Drives. Part II, Belt Drive Problems
Wednesday, July 20
Turntable Drives. Part I, Belt Drive
Thursday, April 14
Antiskating, Part III
Thursday, March 10
Antiskating, Part II
Thursday, February 17
Antiskating, Part I
Thursday, January 27
Tonearm Progress Report
Monday, November 29
Acetate Disc Longevity
Friday, October 29
The Korf Tonearm in More Detail
Wednesday, September 1
Fourth Time Lucky
Friday, July 23
Sony PUA-7 Tonearm
Tuesday, June 29
JBL Paragon — Restoration Complete!
Thursday, June 10
CB-A01 Ceramic Cartridge Spacer/Base
Wednesday, April 21
We Have Bought a JBL Paragon
Friday, April 2
Production Tonearm Prototype — Vertical Bearings
Tuesday, March 2
Production Tonearm — Second Prototype
Wednesday, February 10
Any Point in Wow & Flutter? Part III
Thursday, December 10
Any Point in Wow & Flutter? Part II
Friday, November 27
Any Point in Wow & Flutter? Part I
Thursday, October 29
Do Cartridge Spacers Work?
Thursday, September 10
Alex, What is Taking You so Long?
Sunday, August 9
More About the New Tonearm
Wednesday, June 3
The Post-Coronavirus Update
Tuesday, May 12
On the Importance of Bearings
Monday, March 30
Tonearm and Cartridge Matching, Part IV
Wednesday, February 12
Tonearm and Cartridge Matching, Part III
Thursday, January 23
Tonearm and Cartridge Matching, Part II
Wednesday, January 8
Tonearm and Cartridge Matching, Part I
Thursday, December 5
Building a High-Performance Headshell, Part III
Monday, November 4
Building a High-Performance Headshell, Part II
Friday, October 11
Building a High-Performance Headshell, Part I
Monday, September 30
Is This the Best Headshell in the World?
Tuesday, September 17
Headshell Performance ⁠— Listening, Part II
Friday, August 30
Headshell Performance ⁠— Listening, Part I
Monday, August 19
The GrooveMaster II Tonearm
Friday, August 2
We've Moved
Monday, July 8
Putting a Cap on a Denon DL-103
Tuesday, July 2
Headshell Performance — Ortofon LH-8000
Friday, June 14
Headshell Performance — Micro Seiki H-303
Tuesday, June 4
Headshell Performance — SME 3009
Tuesday, May 28
Headshell Performance — Stamped Aluminium OEM
Monday, May 20
Headshell Performance — Jelco HS-25
Wednesday, May 1
Headshell Performance — Sumiko HS-12
Wednesday, April 17
Headshell Performance — Orsonic AV-101b
Monday, April 8
Headshell Performance — SAEC ULS-2X
Friday, March 29
Headshell Performance — Audio Technica AT-LH13
Wednesday, March 20
Headshell Performance — Nagaoka AL-703
Monday, March 4
Performance of Tonearm Headshells, Part II
Friday, February 22
Performance of Tonearm Headshells, Part I
Wednesday, February 6
Jelco SA-750DB Measurements
Monday, January 7
Turntable Main Bearing Vibration, Part III
Tuesday, October 30
Turntable Main Bearing Vibration, Part I
Wednesday, December 19
Flexure Bearings Revisited, Part II
Tuesday, December 11
Flexure Bearings Revisited, Part I
Wednesday, November 21
Turntable Main Bearing Vibration, Part II
Thursday, October 4
Arm Tubes Revisited — Prototype 11
Thursday, September 6
Azimuth Adjustment Myths and Reality, Part III
Wednesday, August 29
Azimuth Adjustment Myths and Reality, Part II
Tuesday, August 21
Azimuth Adjustment Myths and Reality, Part I
Monday, July 23
3rd and Final Flexure Prototype
Tuesday, June 26
Second Flexure Prototype
Thursday, June 14
Low-frequency Arm and Cartridge Interaction, Part II
Tuesday, June 5
Low-frequency Arm and Cartridge Interaction, Part I
Tuesday, May 22
Surprises in Stock
Wednesday, April 11
A New Project
Thursday, March 15
A Tale of Three Counterweights
Monday, February 19
Closer to State of the Art
Saturday, February 10
Vibrational Energy of MC and MM Cartridges, Part II
Wednesday, January 17
Vibrational Energy of MC and MM Cartridges
Wednesday, January 3
What are We Planning for 2018?
Friday, December 15
Armtube Prototypes — Summary of Findings
Thursday, December 7
Prototype 10, Lacquered Mahogany Wood
Wednesday, November 8
Prototype 9, Mahogany Wood
Thursday, November 2
Prototype 8, Constrained Layer Damping II
Monday, October 23
Prototype 7, Constrained Layer Damping
Tuesday, October 3
We Measure a Rega RB300, Part I
Tuesday, October 10
We Measure a Rega RB300, Part II
Monday, September 25
Prototype 6, Carbon Fibre Mystery
Tuesday, September 19
Prototype 5, No Surprises
Tuesday, September 12
Prototype 4, Rigidity vs Damping
Tuesday, September 5
Prototype 3
Monday, August 28
Prototype 2, and some thoughts on counterweights
Friday, August 18
Evaluation of Prototype 1
Monday, August 14
Sorry for a delay
Tuesday, July 11
Vibrometry on a budget, part II
Monday, July 3
Vibrometry on a budget, part I
Tuesday, June 27
CNC parts are here!
Tuesday, June 13
Geometry Part III. Interaction of static and dynamic errors.
Friday, June 2
Geometry Part II. Dynamic geometric errors.
Monday, May 15
Geometry Part I. Static geometric errors.
Tuesday, May 9
Armtube with Constrained Layer Damping
Tuesday, May 2
The Prints are Here! First Prototype.
Friday, April 7
Test Arm Configuration
Friday, April 14
Armtubes. Have I Missed Anything?
Sunday, April 2
Let's Build a Tonearm
Tonearm Theory
Monday, May 15
Geometry Part I. Static geometric errors.
Friday, June 2
Geometry Part II. Dynamic geometric errors.
Tuesday, June 13
Geometry Part III. Interaction of static and dynamic errors.
Thursday, February 17
Antiskating, Part I
Thursday, March 10
Antiskating, Part II
Thursday, April 14
Antiskating, Part III
Tuesday, June 5
Low-frequency Arm and Cartridge Interaction, Part I
Thursday, June 14
Low-frequency Arm and Cartridge Interaction, Part II
Wednesday, January 8
Tonearm and Cartridge Matching, Part I
Thursday, January 23
Tonearm and Cartridge Matching, Part II
Wednesday, February 12
Tonearm and Cartridge Matching, Part III
Monday, March 30
Tonearm and Cartridge Matching, Part IV
Tuesday, August 21
Azimuth Adjustment Myths and Reality, Part I
Wednesday, August 29
Azimuth Adjustment Myths and Reality, Part II
Thursday, September 6
Azimuth Adjustment Myths and Reality, Part III
Tonearm Measurements
Tuesday, October 10
We Measure a Rega RB300, Part II
Tuesday, October 3
We Measure a Rega RB300, Part I
Monday, February 19
Closer to State of the Art
Wednesday, February 6
Jelco SA-750DB Measurements
Monday, August 19
The GrooveMaster II Tonearm
Tuesday, May 12
On the Importance of Bearings
Friday, July 23
Sony PUA-7 Tonearm
Headshell Measurements
Friday, February 22
Performance of Tonearm Headshells, Part I
Monday, March 4
Performance of Tonearm Headshells, Part II
Wednesday, March 20
Headshell Performance — Nagaoka AL-703
Friday, March 29
Headshell Performance — Audio Technica AT-LH13
Monday, April 8
Headshell Performance — SAEC ULS-2X
Wednesday, April 17
Headshell Performance — Orsonic AV-101b
Wednesday, May 1
Headshell Performance — Sumiko HS-12
Monday, May 20
Headshell Performance — Jelco HS-25
Tuesday, May 28
Headshell Performance — Stamped Aluminium OEM
Tuesday, June 4
Headshell Performance — SME 3009
Friday, June 14
Headshell Performance — Micro Seiki H-303
Tuesday, July 2
Headshell Performance — Ortofon LH-8000
Friday, August 30
Headshell Performance ⁠— Listening, Part I
Tuesday, September 17
Headshell Performance ⁠— Listening, Part II
Monday, September 30
Is This the Best Headshell in the World?
Friday, October 11
Building a High-Performance Headshell, Part I
Monday, November 4
Building a High-Performance Headshell, Part II
Thursday, December 5
Building a High-Performance Headshell, Part III
Cartridge Measurements
Wednesday, January 17
Vibrational Energy of MC and MM Cartridges
Saturday, February 10
Vibrational Energy of MC and MM Cartridges, Part II
Monday, July 8
Putting a Cap on a Denon DL-103
Thursday, October 29
Do Cartridge Spacers Work?
Thursday, June 10
CB-A01 Ceramic Cartridge Spacer/Base
Prototype tonearm — testing armtube configurations
Sunday, April 2
Let's Build a Tonearm
Friday, April 14
Armtubes. Have I Missed Anything?
Friday, April 7
Test Arm Configuration
Tuesday, May 2
The Prints are Here! First Prototype.
Tuesday, May 9
Armtube with Constrained Layer Damping
Tuesday, June 27
CNC parts are here!
Monday, August 14
Sorry for a delay
Friday, August 18
Evaluation of Prototype 1
Monday, August 28
Prototype 2, and some thoughts on counterweights
Tuesday, September 5
Prototype 3
Tuesday, September 12
Prototype 4, Rigidity vs Damping
Tuesday, September 19
Prototype 5, No Surprises
Monday, September 25
Prototype 6, Carbon Fibre Mystery
Monday, October 23
Prototype 7, Constrained Layer Damping
Thursday, November 2
Prototype 8, Constrained Layer Damping II
Wednesday, November 8
Prototype 9, Mahogany Wood
Thursday, December 7
Prototype 10, Lacquered Mahogany Wood
Friday, December 15
Armtube Prototypes — Summary of Findings
Thursday, October 4
Arm Tubes Revisited — Prototype 11
Prototype tonearm — testing flexure bearings
Wednesday, April 11
A New Project
Tuesday, May 22
Surprises in Stock
Tuesday, June 26
Second Flexure Prototype
Monday, July 23
3rd and Final Flexure Prototype
Tuesday, December 11
Flexure Bearings Revisited, Part I
Wednesday, December 19
Flexure Bearings Revisited, Part II
Prototype tonearm — testing counterweight configurations
Thursday, March 15
A Tale of Three Counterweights
Turntable Main Bearing Vibration
Wednesday, November 21
Turntable Main Bearing Vibration, Part II
Tuesday, October 30
Turntable Main Bearing Vibration, Part I
Monday, January 7
Turntable Main Bearing Vibration, Part III
Basic Vibrometry
Monday, July 3
Vibrometry on a budget, part I
Tuesday, July 11
Vibrometry on a budget, part II
Miscellaneous
Wednesday, January 3
What are We Planning for 2018?
Friday, August 2
We've Moved
Wednesday, June 3
The Post-Coronavirus Update
Sunday, August 9
More About the New Tonearm
Thursday, September 10
Alex, What is Taking You so Long?
Friday, November 27
Any Point in Wow & Flutter? Part I
Thursday, December 10
Any Point in Wow & Flutter? Part II
Wednesday, February 10
Any Point in Wow & Flutter? Part III
Tuesday, March 2
Production Tonearm — Second Prototype
Friday, April 2
Production Tonearm Prototype — Vertical Bearings
Wednesday, April 21
We Have Bought a JBL Paragon
Tuesday, June 29
JBL Paragon — Restoration Complete!
Wednesday, September 1
Fourth Time Lucky
Friday, October 29
The Korf Tonearm in More Detail
Monday, November 29
Acetate Disc Longevity
Thursday, January 27
Tonearm Progress Report
Wednesday, July 20
Turntable Drives. Part I, Belt Drive
Tuesday, August 9
Turntable Drives. Part II, Belt Drive Problems
Tuesday, September 13
Turntable Drives. Part III, Idler Drive and its Problems
Tuesday, November 22
Turntable Drives. Part IV, Direct Drive Introduction
Monday, December 12
Turntable Drives. Part V, Direct Drive Torque Ripple
Tuesday, February 21
Turntable Drives. Part VI, Direct Drive Feedback Loops
Monday, March 13
What Causes Turntables to Hum?
Wednesday, April 26
Moving Coil Transformer Hum—How to Fix
Tuesday, September 19
Our Audio Priorities