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About the SP9 MkIII
The SP-9 MKIII is part of a successful line of preamplifiers from Audio Research, with over 7,000 units sold by the time it was released. It includes several technical improvements over its predecessors, such as the use of M.I.T. capacitors, additional filter and bypass caps for the power supply, a new input board, and gold-sleeved tube sockets. The preamplifier is equipped with twin tape inputs and outputs, full monitor switching, and automatic muting for warm-up or voltage drops.
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