Revolutions Per Minute

Vertical Tracking Angle Meets Stylus Rake Angle, Part One

The geometric considerations with regard to vinyl disk recording and…

How Not To Fix Things (Especially Things That Turn)

There are few things more frustrating than having trusted an…

Are 180-Gram Vinyl Records Really Better?

Disk records have been around for a while, long before…

Colored Vinyl: Eye Candy, But is It Ear Candy?

Records, from the age of shellac to the vinyl era,…

The Long-Lost Record Label Concept – Part 1

The record label, that round paper label in the middle…

The Long-Lost Record Label Concept, Part 2: Self-Released Album Psychodrama

In Issue 117 J.I. talked about the origin of the…

Sound Pilot: Interview with Acoustic Design Consultant Philip Newell

Philip Newell has been professionally involved in audio since 1966.…

Acoustic Design Consultant Philip Newell, Part Two

In Part One (Issue 119), acoustical design consultant Philip Newell…

How Hi Would You Like Your Fi?

“High Fidelity” is an ambiguous term. How much Fidelity is…

How Loud Is a Record?

In this article, I shall attempt to shed light on…

Eight Decades of Wrong Assumptions: The Loudness Wars

Let’s cut straight to the chase: Who won the loudness…

The Coil and Its Significance for Recorded Sound

A few days ago I was in the lab (which…

Vinyl and Absolute Polarity: Q&A, Part Two

In Part One of this dialog between J.I. Agnew and…

Vertical Tracking Angle Meets Stylus Rake Angle, Part Two

In Issue 125, J.I. covered the mechanical aspects of record…

Vintage Tube Amplification During a Lockdown, Part One

There are some things that you just have to do…

Vintage Tube Amplification During a Lockdown, Part Two

In Part One, (Issue 127), J.I. told us about being…

The Story of a Vintage Piano, Part the First

In previous issues I have gone into some detail about…

The Story of a Vintage Piano, Part the Second

In Part One, J.I. Agnew began his search for the…

The Big Move, Part One

Ten years ago, I moved to a new building carrying…

The Big Move, Part Two

In Part One (Issue 131), J.I. Agnew wrote about the…

The Big Move, Part Three

In Part One and Part Two, J.I. Agnew wrote about the…

The Giants of Tape, Part One

Tape machines have been made in various shapes, sizes, forms…

The Giants of Tape, Part Two

    Ampex doesn’t really need much of an introduction.…

An Ode to Cassette Tape: Part Two

When thinking of the ultimate cassette deck, many people think…

The Sound of Recorded Music

Different time periods in history are associated with particular architectural…

How Records Are Made, Part 1: Disk Mastering

As mentioned in our previous column in Copper #91, the…

How Records are Made, Part 2: Plating and Pressing

The disk mastering stage, discussed in detail in the previous…

How Records are Made, Part 3: Quality Control

The telephone rings. “We have a few pallets for you,…

Screws, Machine Tools, and the Invention of Sound Recording

How are the ancient Egyptians, Archimedes, Leonardo Da Vinci, and…

From The Cylinder To The Disk Record…And Back?

When the first demonstrations of sound recording and subsequent reproduction…

How Do We Get It Out Of There?

As we have examined throughout several previous issues of Copper,…

The Multiple Facets of Magnetic Recording: A Brief History

Grooved media – phonograph cylinders, gramophone records and so on…

Variations on a Theme of 1/4-Inch Tape

In our previous episode, we had a look at the…

An Ode to Cassette Tape – Part One

I still remember how, as a very young boy, I…

The Rise, Fall, and Resurgence of the Vinyl Record

Two of the world’s leading chip manufacturers have recently announced…

Vacuum Tubes: A Brief History

Vacuum tubes, also known as thermionic valves, or just valves…

Secrets of the Phono Cartridge, Part One

Phonograph disc reproduction cartridges (phono cartridges as they’re known to…

Secrets of the Phono Cartridge, Part Two

At the heart of all phono cartridges we will find…

Linearity in Audio, Part One

In my previous article on vacuum tubes in Issue 103,…

Linearity in Audio, Part Two

Another common usage of the term “linearity” in electronics refers…

Linearity in Audio, Part Three

Up to now we have only talked about the most…

How to Lie with Measurements

In view of my recent series on linearity and other…

Vinyl and Absolute Polarity: A Technical Exposition

One might think that the whole issue of absolute polarity…

For the Record: Restoring a Vintage Disc Cutting Lathe

A customer recently imported a vintage Presto 75A disk recording…

Vinyl and Absolute Polarity: Q&A

Bob Lehman, a classically-educated retired electrical engineer and long-term audiophile,…
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4865 Sterling Dr.
Boulder, CO 80301

Join the hi-fi family

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