ATI Technologies P100S Manuel d'utilisation et d'entretien - Page 5

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MAINTENANCE

Power supply voltages are + and – 15VDC nominal.

IC output DC Voltages under no signal, shorted input conditions should remain

with .1V of ground. Greater deviation is an indication of IC or circuit problems.

MODIFICATIONS

230 VAC OPERATION

Your preamp is wired for 115 VAC, 50/60Hz operation unless otherwise

requested at the time of ordering. It can be modified for 230 VAC operation by

removing the power transformer primary jumpers J11 and J13 and inserting a

jumper in J12.

NEW RIAA CURVE

The RIAA has proposed a modification to its standard curve to help roll off

subsonic rumble.

This modification adds a roll off corner in the playback

response at 20Hz. Although the active two pole subsonic filter in your P100 is

more effective at blocking subsonic inputs than the proposed RIAA curve

change, that change will also affect low frequency audio response by about

1.6db at 30Hz.

When the new curve becomes more generally used you will e able to precisely

math its low frequency response to 30Hz simply by clipping out capacitors C39B

and C40B, thus adding an additional matching 20Hz corner.

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