All items tagged with vacuum tubes (61)

Ray Tubes Launches Select 5U4 Rectifier Tubes

August 21, 2025 by Joao Martins

Ray Tubes Launches Select 5U4 Rectifier Tubes

Ray Tubes added another tube model to its Ray Tubes Select Collection. The Oakland-based vacuum tube company expanded its line-up with new-production 5U4 rectifier tubes in its Select Collection Rectifiers. Although the 5U4 aren't always top-of-mind, they’re a crucial component of tube amps for high-end audio, besides being an essential component in guitar amplifiers, prized for its ability to handle high peak currents. Select 5U4 vacuum tubes are now available from Ray Tubes' global network of retail partners.

Ray Tubes Expands Range with Select 12AU7 and Core 12AU7 Vacuum Tubes

August 4, 2025 by Joao Martins

Ray Tubes Expands Range with Select 12AU7 and Core 12AU7 Vacuum Tubes

Ray Tubes announced new-production 12AU7 tubes in both its Core and Select Collections. With this addition, Ray Tubes is now supplying the most common vacuum tubes, including the 12AU7, 12AX7, EL34, 6SN7, KT88, and 300B, all available through its network of retail and brand partners. All products from Ray Tubes are designed and tested specifically for audio applications and come with a one-year warranty, which is a great assurance compared to the risks of buying New-Old-Stock items.

Book Review: Zoran M. Dukic’s High End Tube Amplifiers Designer Tool Box

May 7, 2025 by Jan Didden

Book Review: Zoran M. Dukic’s High End Tube Amplifiers Designer Tool Box

This extensive, 428-page, self-published hardcover book, is much more than another publication on tube amplifiers. As Jan Didden discovered, this book contains all the knowledge needed to check how an input low-pass filter must be dimensioned, how to investigate the different resistor types and their properties, capacitor types, which tubes to use, how to bias them, and construct the load lines, and even how to design low-noise power supplies. A one-stop resource for tube-based audio power amplifiers, and clearly a work of love!

Hollow-State Electronics: The Orange Valve Tester MKII

September 25, 2024 by Richard Honeycutt

Hollow-State Electronics: The Orange Valve Tester MKII

The Orange Valve Tester MKII is a new microprocessor-controlled testing system from the famous British guitar amplification manufacturer. Featuring greatly improved algorithms with an updated database containing the test results of literally hundreds of new, used, and faulty valves, this MKII tester requires no knowledge of valve theory. A user simply inserts a valve into the correct socket, selects the valve type from the list, and presses the ‘OK’ button. The status of the valve under test is quickly revealed.

McIntosh Launches C55 and C2800 Network Connected Preamplifiers

March 14, 2024 by audioXpress Staff

McIntosh Launches C55 and C2800 Network Connected Preamplifiers

McIntosh Laboratory announced the launch of its latest preamplifiers with updated connected features, the return of the Processor Loop, allowing to insert an external signal processor and an update Quad Balanced, 8-channel, 32-bit Digital-to-Analog Converter (DAC) with support for 24-bit/192kHz and DSD512 files. The C55 Solid State Preamplifier and the C2800 Vacuum Tube Preamplifier, are both Roon Tested and offer 16 inputs, including HDMI ARC and a USB input for DSD and DXD 384kHz support, and a dedicated subwoofer output.

Audio-Technica Introduces Narukami Ultra-High-End Tube Headphone Amplifier and Headphones

March 7, 2024 by audioXpress Staff

Audio-Technica Introduces Narukami Ultra-High-End Tube Headphone Amplifier and Headphones

Audio-Technica is introducing its Narukami ultra-high-end audio products, which are meant to take the pursuit of analog and tube sound reproduction to a new level of excellence. Making their US premiere at CanJam NYC 2024 (March 9 – 10 at the Marriott Marquis, New York), the Narukami HPA-KG NARU Tube Headphone Amplifier and ATH-AWKG Closed-Back Dynamic Wooden Headphones are ultimate-quality works of audio art. With a price that could buy a house not a long time ago, this is in the above-luxury category.

Everything That's Audio in audioXpress December 2023

November 14, 2023 by audioXpress Staff

Everything That's Audio in audioXpress December 2023

audioXpress December 2023 includes a market overview of multiroom audio, Brent Butterworth writes about new ways to measure ANC earbuds, and Stuart Yaniger measured the new Axign and GaN Systems Class-D audio amplifier board. Richard Honeycutt writes about tubes, BJTs, JFETs, MOSFETs, and ICs, and Dimitri Danyuk, discusses JFETs in audio circuits. Douglas Self explains how to optimize variable-frequency tone controls, and Jan Didden shares his eDD direct-drive amplifier project.

Nagra Now Shipping HD PHONO Reference Preamplifier

November 6, 2023 by audioXpress Staff

Nagra Now Shipping HD PHONO Reference Preamplifier

The result of more than four years of R&D efforts, Nagra's new ambitious phono stage is finally in production and the first units are shipping worldwide. Audio Technology Switzerland is already delivering the first units of this new Nagra design, the ideal companion to the Reference turntable and Reference MC cartridge. When all three systems are combined they form the ultimate analog source - a reference playback solution for LP lovers.

Active Acoustics, Noise Cancellation, and Product Development in audioXpress August 2023

July 14, 2023 by audioXpress Staff

Active Acoustics, Noise Cancellation, and Product Development in audioXpress August 2023

As audioXpress August 2023 focus on Acoustics, read the report on Electroacoustic Enhancement and Active Acoustics. René Christensen details the model and application of the SonicEdge Ultrasound Speaker. Philipp Paul Klose writes about Noise Cancellation in Automotive Audio. And we visit the Western Electric Tube Factory in Rossville, GA. Read the AXPONA 2023 show report, how to Design a True Midrange Driver, and how to build an Instrumentation Amplifier-Based Preamplifier Line Stage.

Tube Amp Doctor Launches New TAD KT88-STR REDBASE Premium Selected Tubes

July 14, 2023 by audioXpress Staff

Tube Amp Doctor Launches New TAD KT88-STR REDBASE Premium Selected Tubes

In their 30th year as a company, Tube Amp Doctor has expanded its REDBASE tube family with a new exclusive and high-quality premium tube model, the entirely new TAD KT88-STR REDBASE. TAD just announced that they now have stock of the newest addition to the REDBASE-tubeline - the KT88-STR REDBASE. And the best news in these times is that the new tubes are ready to ship worldwide, meeting the strong demand for heavy-duty KT88 tubes!

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