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.

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 ...

WEBER-HYDRAULIK EASYPROP Unlike analogue valve amplifiers, the EasyProp simply requires a laptop or smartphone and has a proportional-integral-derivative controller that allows for control loops ...

valve amplifier 1 Articles . The Best Stereo Valve Amp In The World. August 16, 2017 by Jenny List 83 Comments . There are few greater follies in the world of electronics than that of an ...

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.

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 ...

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 ...

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 ...

The amplifier offers the means of magnifying varying electro-motive forces and currents, otherwise imperceptible, so that they come within the range of ordinary laboratory measuring and recording ...

Tube amp stories are always popular on Gadget Master, and this one certainly looks the part, a Desktop Valve Amplifier for hi-res music lovers. The devil is in the detail, of course - and I'm no audio ...