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no, because all the preamps are off when i power up the amps

the preamps get powered up last, after the power amps are up and running. the "hum" definitely comes from the power amp, because you can hear it when everything else is off.

the TA-P9000ES is "new" - actually, a factory "seconds" unit purchased with full warranty as new ones are impossible to get (Sony discontinued them a year or so ago) - i know about the buzzing problem, but i don't know whether my unit has the fix applied or not. certainly i haven't had any issues with powering it up or down so far.

interestingly, the system is deliberately designed as three "independent" systems, driven by the three separate preamps. Ie., it is possible to operate the system on any one preamp with the other two preamps completely switched off (and even with the plug pulled) through clever use of the power amp input switches and passive switching. this is done by minimise noise and signal corruption.


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