Owner's manual

X250.5 Owners Manual

Do ever ybody a favor and try not to have shorted output cables. It

happens accidentally all the time, and the amplifier is designed to sur-

vive, mostly.

Of course it’s always possible that something could g o wrong. If so,

don’t g et excited, just relax. It’s really ag g ravating when something like

this doesn’t work, we understand, but it will g et fixed. We g o to a lot

of trouble to make products reliable, and the failure rate of our ampli-

fiers is very low. This is small comfor t to the few, but take it easy and

give us a call if you have problems.

People are often interested in how long it takes for these amplifiers

to break in. Perhaps a more salient question is how long does it take

them to reach their sonic best after tur n on. It takes about an hour for

them to fully war m up, and this is where we adjust them first. T hen

we adjust them ag ain and again over a couple of days, keeping the bias

and offset in the sweet spot. Our environment is about 23 degrees

Centig rade and the heat sinks will rise approximately 25 deg rees C.

above that, for an average on heat sink temperature of 48 deg rees C.

Sonically they are at their best when the heatsinks are approximately

50 deg rees C.

In your setup the temperature may var y a bit due to line voltage varia-

tions and ventilation, but this is not a big deal. You should be able to

put your hands on the heat sinks without discomfor t for 10 seconds

or so. It is nor mal for the heasink temperature to var y side-to-side and

front to back.

The amplifier has a ther mal cutout that will disconnect AC power if

the temperature exceeds 75 deg rees Centig rade. This should never

occur in real life.

More things to know

You can remotely operate the stand-by mode by applying 12 volts DC

to the single pair of binding post connectors on the rear of the ampli-

fier. The positive of the 12 volts DC goes to the red connector. This

connection has an actual operating range of about 9 volts to 15 volts

at a cur rent draw of approximately 5.0mA. T his switching will over-

ride the front panel button, so if you want the front panel button to

operate, leave the rear connection open.

So much for the most essential information.

You are ready to play music