Proceed PDP - Manual (Page 10)

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9. Connect the power supply cord of the PDP 3 to an unswitched
convenience outlet (like those on the rear panel of many audio
components). If you connect the PDP 3 directly to a wall outlet,
make sure that the outlet has polarized sockets.
10. Set the master power switch on the rear panel to the “|” (on)
position, and allow the PDP 3’s circuitry to stabilize for several
minutes before operating it.
Note: The PDP 3 won't achieve its sonic potential right away —
sonic performance is close to the optimum after 350 hours (or
about two weeks of normal use). For the best performance, you
may leave it powered at all times, except when you won't be using
it for a long period (see "Important Safety Instructions").
The PDP 3 may be turned on and off without affecting its longevity.
When it is turned on after being left unpowered, allow about one
hour before expecting optimal sonic performance.
NEVER operate the master power switch without first making sure
that power is turned off to your receiver, integrated amplifier, or
preamplifier/power amplifier.
11. After making all connections and turning the master power switch
on, turn on the other components in your system.
Power supply connection
master power switch
PRECAUTION