All items tagged with RIAA Phono (24)

You Can DIY: A New Op-Amp for Phono Preamps - Part 2 - Development and Measurements

July 9, 2025 by Brian Lowe

You Can DIY: A New Op-Amp for Phono Preamps - Part 2 - Development and Measurements

Brian Lowe (Belleson) developed a unique custom-designed transconductance amplifier (Bel Amp) with fully differential (balanced) low-noise JFET inputs and current output. it offers 50dB of current gain prior to any voltage excursion, virtually eliminating distortion caused by voltage-dependent node capacitance exhibited by more conventional approaches. This is the second article detailing the op-amp design, containing simulations and measurements.

You Can DIY: A New Op-Amp for Phono Preamps Part 1 - The Design

July 2, 2025 by Brian Lowe

You Can DIY: A New Op-Amp for Phono Preamps Part 1 - The Design

Brian Lowe (Belleson) developed a unique custom designed transconductance amplifier (Bel Amp) with fully differential (balanced) low noise JFET inputs and current output for phono preamps. This article details the requirements and parameter values, while exploring design options. A second article explains the discrete op-amp design, complete with simulations and measurements.

audioXpress January 2025. Innovations in Audio. Product Development. The Best in DIY Audio

December 12, 2024 by audioXpress Staff

audioXpress January 2025. Innovations in Audio. Product Development. The Best in DIY Audio

In this issue we write about some of the most innovative Drivers and Transducers from the past two years. Read about dual-driver true wireless earbuds, and how to assess listening effort inside vehicles. Douglas Self shares his latest findings on Modern Op-Amp Distortion Tests, and René Christensen explores the analytical framework that sustains great simulation techniques. Reviews of the APL Virtuoso v2 Binaural Renderer, and the Purifi 1ET9040BA amplifier module.

Joachim Gerhard on Low Noise Phono Stages: The Discrete INA Design

November 13, 2024 by Jan Didden

Joachim Gerhard on Low Noise Phono Stages: The Discrete INA Design

Ask audio industry insiders and audiophiles alike about Joachim Gerhard, and chances are that they mention the many high performance speakers he designed over the years. But he also has a great track record designing phono preamps and this interview explores that aspect of Joachim’s career. In this second part of the interview, Jan Didden explores Gerhard's design ideas and goes into details on his Discrete INA design, a discrete input stage instrumentation amplifier topology.

Belleson To Unveil Radiance Phono Preamplifier at Capital Audiofest 2024

October 28, 2024 by Joao Martins

Belleson To Unveil Radiance Phono Preamplifier at Capital Audiofest 2024

Belleson announced it will present the new Radiance phono preamplifier at Capital Audiofest 2024. According to the high-performance audio equipment manufacturer from South Carolina, the Radiance preamp is based on Brian Lowe's custom designed Top Amp circuit, in a single stereo phono input configuration, with exceptional low noise, and low distortion, allowing users the convenience of fine-tuning cartridge loading while listening to music, all remotely controlled via Wi-Fi.

From the Vault: The Borbely Preamp

May 14, 2024 by Erno Borbely

From the Vault: The Borbely Preamp

"Designing a preamp is probably the most challenging engineering task in the audio chain, and many designers have invested a lot of time and effort in it," wrote Erno Borbely in this original 1985 article for the Audio Amateur. "My reason for designing this preamp is quite simple: I wanted to have a top-quality preamp without paying megabucks for a Levinson or Accuphase unit. It is up to you to decide whether or not I have succeeded in achieving the same quality." This article was originally published in The Audio Amateur Issue 4, 1985, and is still frequently referenced.

Goldring Announces New E4 Cartridge Targeting Budget or Midrange Turntables

May 15, 2023 by audioXpress Staff

Goldring Announces New E4 Cartridge Targeting Budget or Midrange Turntables

Goldring introduced its new flagship E Series moving magnet cartridge, the E4. Designed as a a cost-effective upgrade for any modern budget or midrange turntable, the new Goldring E4 represents the pinnacle of the E Series engineering, focused on performance. The E4 is designed to be compatible with all medium-to-high-mass tonearms of the type found on the majority of budget to midrange turntables.

Vertere Acoustics Announces Updated DG-1S Turntable and Phono Preamp

July 29, 2022 by audioXpress Staff

Vertere Acoustics Announces Updated DG-1S Turntable and Phono Preamp

Vertere Acoustics announced that its DG-1 record player/turntable has been updated and improved. After little more than three years, the company already had many ideas on how to improve its original product and announced the DG-1 S, which will be available in September 2022. Also updated and improved is the Vertere PHONO-1 MKII L MM/MC Phono Preamplifier, now featuring a new gold-plated L-shaped PCB and significantly enhanced accessibility for the customization DIP switches.

August 4, 2021 by audioXpress Staff

Fidelity Imports to Distribute Goldring Brand in the US

Founded in 1906, Goldring remains one of the world’s leading designer and manufacturer of phono cartridges. Today, with more than 100 years of rich heritage behind them, Goldring continues to deliver high performance, premium quality products for the specialist cartridge and turntable market, including the flagship moving coil Ethos cartridge and the entry-level E series range. Fidelity Imports is now responsible for distributing Goldring’s entire portfolio of products throughout the US.

You Can DIY! X-Altra MC-MM RIAA EQ Preamp - Part 2

May 19, 2021 by Andrew C. Russell

You Can DIY! X-Altra MC-MM RIAA EQ Preamp - Part 2

For all our readers who started following the X-Altra Moving Coil/Moving Magnet RIAA EQ Preamplifier DIY project publish in the February 2021 edition of audioXpress, we have the final pieces. In this second article, Andrew C. Russell details the Moving Magnet EQ stage, system gain amplifier and filters, along with the system’s power supply unit. The article concludes with some measurements.

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