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Further information: HD3S is made in the UK by World Designs. Available either as a kit or pre-built. This HD3S standard for sale is built and tested by the manufacturer in UK. A beautifully simple, yet sophisticated, stereo headphone amplifier design using ECL83 valves. The unit works directly from any source and includes headphone impedance matching for optimum results from your favourite headphones. With the current interest in high quality headphones driven by the portable audio revolution, this is the right product to get the best from them. Until you try a good