The Dynaco ST-70 is one of the most popular tube amplifiers ever. First released in 1959, it's still sought after by hi-fi enthusiasts today.

We present the experimental demonstration of a traveling-wave tube (TWT) power amplifier operating in the W-band (75-110 GHz) frequency range. The device is based on a serpentine waveguide (SWG) ...

Victory Amps has given the Deputy a makeover, rehousing the 25-watt tube amp head in a portable lunchbox format – but retaining all the original features that were developed in partnership with Pete ...

Let's take a spin through some of what I consider to be the best tube amps on the market today (not counting priceless vintage artifacts).

Discover the untapped potential of this 300B tube amp that's flying under the radar. Our review uncovers its unique features, sound quality, and why it's a must-have for serious audiophiles. Don't ...

Discover the advantages of instrumentation amplifiers (INAs) and how they can improve performance in various applications.

Here comes a new compact power amplifier that isn’t made in China: Pro-Ject Audio Systems’ Amp Box RS2 is made in Europe; it connects a tube-buffered input stage to an all-discrete Class A/B output ...

We present electromagnetic cold-test measurements of BeO ceramic pillbox vacuum windows for a 220-GHz traveling-wave tube amplifier. Transmission and reflection measurements show better than 20 dB ...

Priced from $10,000, the Feliks Audio Envy Meisterwerk headphone amplifier features all analog circuitry with 300B vacuum tubes.

Stereo amplifiers come in various flavors. We have affordable picks for full-featured integrated amps, discreet mini amps, and powerful stereo receivers.

Schiit’s latest wallet-friendly headphone amplifier, the Vali 3, reportedly began life as a cosmetic redo of the tubed-up Vali++. The new and stylishly dipped chassis pattern lends the product a ...

Circuit: DIY Compact Tube Amp Building a tube amp is a dream for many engineers and makers alike. But factors like the cost, large enclosure, transformers, and complicated wiring harnesses can scare ...