Front Panel Controls; Remote Volume Control; Tubes - Mapletree Line 2CRM User Manual

Ps 2d power supply

Table of Contents

Front Panel Controls

The front panel controls are (left to right) the 3-position Source selector switch (Line1-

Line2-Line3), Mode switch (Stereo or HT), Volume control, and Balance control. In HT

mode, the selected input source is connected to the output jacks and the active preamp

output is disabled; the power may be turned off.

Line 2CR M P r e amplifie r

The volume control IR sensor is located between the volume and

balance control as shown above. The remote handset has buttons for

volume up and down. The power button is disabled. When first

turning on the power supply, the volume control will reset to zero and

then advance to the 9 o'clock position. It is designed to avoid

unexpected high volume levels when powering up.

The tubes supplied are new-old stock (NOS) and have been pre-tested. A burn-in period

of several hours may be needed to achieve the best sonic performance. Tube life should

be thousands of hours. Aging tubes may result in a reduced gain in one or both channels

or an increase in noise levels. Infrequently, a heater may burn out which is indicated by

total loss of sound. Replacement tubes can be obtained from several suppliers in the U.S.

and Canada. Some listeners enjoy trying different brands and variants of tubes. The

heater voltage selector switch permits the use of 6SN7GTB (or the 5692 special red

version) tubes of NOS or current manufacture. The highly regarded 12SX7GT is

equivalent to the 12SN7GT.

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