Copper Magazine · Issue 235 · A free PS Audio publication
Issue 235 Audio Anthropology

Evolutionary Growth

Evolutionary Growth

OK, this gets the author's vote as the coolest preamplifier ever. It's a Philips AG9004-00 from the 1950s. Not much information is online, but wow, what a looker! Maybe not the most ergonomic knobs in the world, though. Courtesy of Wikimedia Commons/Alex P. Kok.

 

Listening to the radio, 1930s style, courtesy of the Telefunken 340W. These were nicknamed the "katzenkopf" or "cat's head" for obvious reasons and featured a bakelite case.

 

Here's an all-time classic McIntosh piece: the C22 stereophonic preamplifier. It was available from 1962 to 1972 and offered two phono inputs, two tuner inputs and more, with extensive switching and sound-tailoring facilities. The C22 is so iconic that it's still being made today in a Mk V version. Courtesy of Wikimedia Commons/Sebastian Nizan.

 

In the 1950s, these Silvertone model 8220 "Dur-Pac" transistor and 8217 tube radios were the latest in portable audio. We suppose they were, compared to those immense wooden consoles. The top knob rotated an antenna built inside the case. High tech! Courtesy of Joe Haupt (both the 8220 and 8217)/Wikimedia Commons.

 

Tube technology was growing by leaps and bounds in the 1930s, as seen in this 1934 chart from Electronics magazine. Courtesy of Wikimedia Commons/public domain.

 

"Look at all this fictional equipment that couldn't possibly work in real life!" Header image courtesy of Shopify AI.

More from Issue 235

Checking Out Some NOLA Loudspeakers – and Some Thoughts About Audio Writing
Checking Out Some NOLA Loudspeakers – and Some Thoughts About Audio Writing
Frank Doris
The Kanazawa Phonograph Museum: Music from a Time Capsule
The Kanazawa Phonograph Museum: Music from a Time Capsule
Sebastian Polcyn
PS Audio in the News
PS Audio in the News
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From The Audiophile’s Guide: Making the Most Critical Choice
From The Audiophile’s Guide: Making the Most Critical Choice
Paul McGowan
Speed Racer
Speed Racer
Peter Xeni
Happy Halloween!
Happy Halloween!
James Schrimpf
View All Articles in Issue 235

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#235 Checking Out Some NOLA Loudspeakers – and Some Thoughts About Audio Writing by Frank Doris Oct 05, 2026 #235 The Kanazawa Phonograph Museum: Music from a Time Capsule by Sebastian Polcyn Oct 05, 2026 #235 PS Audio in the News by PS Audio Staff Oct 05, 2026 #235 From The Audiophile’s Guide: Making the Most Critical Choice by Paul McGowan Oct 05, 2026 #235 Evolutionary Growth by Frank Doris Oct 05, 2026 #235 Speed Racer by Peter Xeni Oct 05, 2026 #235 Happy Halloween! by James Schrimpf Oct 05, 2026 #234 A Life in High-End Audio: The Roy Hall Interview, Part One by Frank Doris Sep 07, 2026 #234 Jason Greenlaw Offers His Personal Perspective on Jazz Guitar in Vantage Point by Frank Doris Sep 07, 2026 #234 Transcendent Phoenix: Lucina Yue Brings the Ancient Konghou Into Modern Times by Frank Doris Sep 07, 2026 #234 We Must All Follow Our Bliss by B. Jan Montana Sep 07, 2026 #234 How to Play in a Rock Band, 27: Leveling Up by Frank Doris Sep 07, 2026 #234 Ross Valory: Traveling Into New Musical Territory With All of the Above by Ray Chelstowski Sep 07, 2026 #234 Singer/Songwriter John David Schrader: On the Need to Create by Joe Caplan Sep 07, 2026 #234 The People Who Make Audio Happen: More From T.H.E. Show SoCal 2026 by Harris Fogel Sep 07, 2026 #234 The Vinyl Beat Digs Into the Gadget Box by Rudy Radelic Sep 07, 2026 #234 The Rolling Stones: Foreign Tongues Spoken Loud by Wayne Robins Sep 07, 2026 #234 Musical Moments by Rich Isaacs Sep 07, 2026 #234 Rags for Solo Piano and a Dog: David Chesky's Ragtime Music for the Modern Age by Frankly Speaking Sep 07, 2026 #234 HIGH END 2026, Vienna: Here to Stay by Carsten Barnbeck Sep 07, 2026 #234 From The Audiophile’s Guide: The Two Main Types of Loudpeakers – Box and Panel by Paul McGowan Sep 07, 2026 #234 Letting it Slide by Frank Doris Sep 07, 2026 #234 PS Audio in the News by PS Audio Staff Sep 07, 2026 #234 Long Playing by Peter Xeni Sep 07, 2026 #234 La Mer by B. Jan Montana Sep 07, 2026 #233 A Report From The Total Hi-Fi Experience Show SoCal 2026 by B. Jan Montana Aug 03, 2026 #233 Bluegrass Meets Country, Folk, Jazz and More in All That We Carried by The Squid City Slingers by Frank Doris Aug 03, 2026 #233 Corey Glover and One Tribe Nation: A Variegated Musical Collective by Ray Chelstowski Aug 03, 2026 #233 Excursions with Clive: The Late Clive Davis, A Personal History by Wayne Robins Aug 03, 2026 #233 AI, Art, and Music: A Conversation With Synthography Art by Joe Caplan Aug 03, 2026 #233 New American Symphonies: A Rediscovered Gem and a Vital Contemporary Work by Frank Doris Aug 03, 2026 #233 The Vinyl Beat: Genesis, the Dave Clark Five, Antonio Carlos Jobim and More by Rudy Radelic Aug 03, 2026 #233 How to Play in a Rock Band, 26: When It's Time to Record Your Music by Frank Doris Aug 03, 2026 #233 More From T.H.E. Show 2026, and the People Who Made it Happen by Harris Fogel Aug 03, 2026 #233 Underappreciated Artists, Part Three: Icehouse by Rich Isaacs Aug 03, 2026 #233 The Surprisingly Rich and Varied Music of Somalia by Steve Kindig Aug 03, 2026 #233 A Remarkable Discographic Legacy: The LP Recordings of the Basel Symphony Orchestra by Stephan Haberthür Aug 03, 2026 #233 From The Audiophile’s Guide: The Importance of Loudspeakers by Paul McGowan Aug 03, 2026 #233 From Swimming Pool to New Listening Room: A Conversation with Norman Varney of AV RoomService by Gilles Laferrière Aug 03, 2026 #233 PS Audio in the News by PS Audio Staff Aug 03, 2026 #233 Audio Jewelry by Peter Xeni Aug 03, 2026 #233 Enrich Your Life by Frank Doris Aug 03, 2026 #233 The Searcher by James Schrimpf Aug 03, 2026 #232 What came first: Art or Music? A Conversation With Artist Jose Acosta by Joe Caplan Jul 06, 2026 #232 Blow By Blow: The Jeff Beck Story: An Insightful Book About a Guitar Icon by Ray Chelstowski Jul 06, 2026 #232 Creed Over Camaraderie? by B. Jan Montana Jul 06, 2026 #232 Chronicles of a Sound Pilgrim at the 2026 Montreal Audiofest by Hugues Morin Jul 06, 2026

Evolutionary Growth

Evolutionary Growth

OK, this gets the author's vote as the coolest preamplifier ever. It's a Philips AG9004-00 from the 1950s. Not much information is online, but wow, what a looker! Maybe not the most ergonomic knobs in the world, though. Courtesy of Wikimedia Commons/Alex P. Kok.

 

Listening to the radio, 1930s style, courtesy of the Telefunken 340W. These were nicknamed the "katzenkopf" or "cat's head" for obvious reasons and featured a bakelite case.

 

Here's an all-time classic McIntosh piece: the C22 stereophonic preamplifier. It was available from 1962 to 1972 and offered two phono inputs, two tuner inputs and more, with extensive switching and sound-tailoring facilities. The C22 is so iconic that it's still being made today in a Mk V version. Courtesy of Wikimedia Commons/Sebastian Nizan.

 

In the 1950s, these Silvertone model 8220 "Dur-Pac" transistor and 8217 tube radios were the latest in portable audio. We suppose they were, compared to those immense wooden consoles. The top knob rotated an antenna built inside the case. High tech! Courtesy of Joe Haupt (both the 8220 and 8217)/Wikimedia Commons.

 

Tube technology was growing by leaps and bounds in the 1930s, as seen in this 1934 chart from Electronics magazine. Courtesy of Wikimedia Commons/public domain.

 

"Look at all this fictional equipment that couldn't possibly work in real life!" Header image courtesy of Shopify AI.

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