The company’s newest headphone amplifier, the Valhalla 3, isn’t just a new-and-improved version of the Valhalla 2, which had ...

A glance at any outlet through which Chinese modules can be bought will find this type of tube in small audio amplifier projects ... tube you will see in audio power amplifier kits is the FU32 ...

Initially, the project began as a headphone amplifier but morphed into a design specifically for guitar and bass, with preamp and power amp stages and adjustable input impedance – 500kΩ for ...