Changing fuses, wiring plugs, swapping turntable cartridges ... My own living-room hi-fi amp is an old Cambridge Audio Azur 540r – an AV receiver with some impressive I/O, from a brand ...

€3999), as fronted by the matching M66 pre-amplifier (€5999). With which loudspeakers? Vivid Audio’s Portuguese distributor Ajasom was kind enough to lend me a pair of the Kaya 90 dressed in silver.

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 ...

It does this by putting a filter in front of the amplifier, with a potentiometer to select the mix of frequencies. This goes into a LM386 audio amplifier. At the output is a Zobel network to keep ...