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hi folks I am josef from austria and I am searching for an amplifier builder, probably a private person, named mark richards, I own a pair of 2A3 push pull/PSE monoblocks, each monoblock bears 4 2A3 in pushpull mode, and leaving the outside tubes, 2 2A3 in PSE mode, on top is written "Klystron-handbuilt by mark richards", so i would be very interested to know this man, cause the amps are very fine built and sound superior. Maybe someone knows this man best audiophile wishes to england from austria josef