I do have a question, if you don’t mind: I bought a pre-amp like this one, already build, with a pair of 6j1 valves. It was sold with a 12V power supply, supposedly, rated at 1A.

Money no object: Audio Research's 'finest-ever power amplifier' is the culmination of 55 years at the apex of valve amp design and boasts a huge 330W of power.

The valve amp has sat forlornly on the shelf, a reminder of a past glory that maybe one day I’ll resuscitate. Perhaps I’ll give it a DSP board programmed to cure its faults.

The Desktop Valve Amplifier is wrapped in a 140 x 120 x 25 mm (5.5 x 4.7 x 0.9 in) CNC aluminum housing, which has a viewing window to the top so that listeners can enjoy the warm glow of the ...

There's a surplus of the Russian GU81 valves used in the MB81 amp, Shaw said, and it makes them relatively "cheap" to get hold of. Only £21K cheap, mind. Such huge valves give the amp immense ...

The clever bit about the Copland’s circuitry is its ability to accommodate different types of output valves without issue. Not only does the circuit’s servo-based system automatically adjust bias ...

Normally a valve amp leaves its components exposed to aid cooling of the hot vacuum tubes, but Futatsumata’s design encases everything in a smooth metal heat-sink — even the dials are aluminum ...

Old-style valve amplifiers are the real ale of the technology world. Both are handcrafted lovingly in rural backwaters of Britain, and both have a long-standing tendency to attract middle-aged men ...

Recently, I picked up the phone to one of the most knowledgeable tonesmiths on the British scene, Dan Coggins.Dan was the designer behind the highly influential Lovetone effects pedals from the 1990s, ...

Since the Mal Valve is one of the rare headphone amplifiers that can drive electrostatic and dynamic headphones, I also auditioned the sound with a pair of Stax SR 007 electrostatics.

The power amp simulation feature allows you to change the response of the amplifier, say, choosing an EL34 response for a more ostensibly British feel. There is a rotary dial on the front panel that ...