Based in Copenhagen, Denmark, FreqPort’s flagship product is the FreqTube FT1. FreqTube is the answer to the question: how ...

Some preamp pedals emulate a certain type of circuit, some are more like overdrive pedals with some extra features, but the IR-D promises more. Like the IR-X that was launched in September 2023, it ...

The minimalist design of the K2-W magically gets by with two 12AX7 high-mu, double-triode, vacuum tubes; a handful of resistors; a few caps; and a couple of cheap neon glow lamps, as can be seen ...

Recognizing the nonlinear behavior of the 12AX7 vacuum tube, used in audio and old op-amp applications, Dr. Dyer compares various models for fit to real-world device data.