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.

With a $699 tag, the O Turntable is belt-driven and comes with a pre-installed MM cartridge and a built-in phono preamp for easy connection with almost any amp or receiver ...

A traveling wave tube amplifier operating above 300 GHz based on folded waveguide (FWG) slow-wave structure is presented in this paper. The design and test results of key components are presented, ...