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conduct AC line voltage to ground until the fuse blows in case of transformer or
other such failure.
The input impedance is 48 Kohms, and the input capacitance is very low, so you
should find it easy to drive with tube equipment if you like. The amplifier is largely
indifferent to the source impedance of your preamp, so a high source impedance
is not a problem.
The amplifier requires about 1 hour of operation to reach normal operating
temperature, and this warm-up time is appropriate for the most critical listening,
but is not otherwise an issue. The amplifier's final adjustments were made after
an hour, and the performance difference between 5 minutes and 60 minutes is
significant.
I do not personally see a reason to run the amplifier all the time, but you can do
that if you want to. The power supply capacitors are likely to last about 15 years
or so, and while they will slowly dry out just sitting there, they will have a shorter
life span with the amplifier running constantly. Also, at 160 watts it makes
economic sense to shut the amplifier off if you aren't planning on using it for the
rest of the day.
Again, the heat sinks on this amplifier run fairly hot, and you want to make sure
that they get adequate ventilation. They will run at around 25 degrees C. above
the ambient temperature, which puts them around 50 degrees in the average
listening room. At this temperature you should be able to put your hand on them
for about 5 to 10 seconds or so.
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