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.

Years ago, intrigued by the hype around NOS tubes and the promise that they could magically transform my amps into tonal bliss, I invested in a stash of pricey NOS 12AX7 preamp tubes just to see what ...

Hi-Fi Stereo Amplifiers Best stereo amplifiers 2025: 9 class leaders chosen by our review experts Best Buys By Becky Roberts Contributions from Tom Wiggins last updated 14 July 2025 Breathe life into ...

The best tech products announced this week include Orange Amps' first-ever turntable and Nothing's striking noise-canceling ...

Discover the FiiO K15 DAC Headphone Amp: A powerful, affordable desktop solution offering balanced audio, Wi-Fi, and Bluetooth, all for $549. Compare with top contenders like Schiit Asgard X and ...

Stereo amplifiers have moved with the times. Today, they increasingly bolster their traditional analogue connections with digital ones, facilitated by the necessary DAC chip and all the other digital ...

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) ...

A novel planar slow wave structure (SWS) for traveling wave tube (TWT) is proposed. The major advantage of the planar architecture is its easy realization with respect to the typical 3-D SWSs. The ...