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SOS on Audio Research SP-9MKII

I was listening to it today for about 2 hours. All of sudden, the sound shut off. I went to the system and saw SP-9 LED turned to green. It was like in mute mode. Then I turned off and turned it back on. The machine seemed working fine, then it shut off again in 5 minutes. What went wrong? Is it the tube or something else? Please help.


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Topic - SOS on Audio Research SP-9MKII - dd168168 10:56:24 02/28/15 (9)

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