That should be safe provided you don't exceed 15A of current through it, and that shouldn't be difficult because few audio components will draw 20A of current. But it seems like a cumbersome solution - you could just as easily put a 20A receptacle in an existing outlet and keep it on a 15A breaker.
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Primary sources: VPI TNT III/SDS turntable, SME-V arm; Bryston BDP-3 digital player; Bryston BDA-3 DAC; McIntosh MVP-881 disc player; McIntosh MR-80 tuner. Preamplifier Audio Research Ref 5SE; Audio Research Ref Phono 2SE; Moon 430 HA. Amplifiers Conrad Johnson Premier 1B; Audio Research D-300; Bryston 4B. Speakers Infinity IRS Beta. Recorders Tandberg TD20A; Crown SX-822; Nakamichi 670ZX; Alesis Masterlink ML-9600. Power Tice Power Block/Titan (x2); McIntosh MPC1500; API Ultra II-20; multiple 20A derated dedicated lines.
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