Mapletree Line 2C, PS 2D User Manual

Modular Series

Line 2C Stereo Line Preamplifier

PS 2D Power Supply

User’s Manual

Rev. Mar 10, 2019

Mapletree Audio Design

R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0

[phone]
www.mapletreeaudio.com

[e-mail]

© Copyright Lloyd Peppard 2002-2019 -Specifications are subject to change without notice-

Introduction _

The Mapletree Audio Design Line 2C Stereo Line Preamplifier offers the audiophile a
number of desirable features:

 Bypass switch on front panel for home theatre (HT) operation.

 Exclusive use of NOS octal tubes, known for low distortion and musicality.

 Switchable for use with 12SN7GT or 6SN7GTB tubes.

 High input impedance and low output impedance.

 Three parallel output jacks for bi-amp/headphone amp/HT applications.

 Audio grade polypropylene film capacitors in signal path.

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Power Supply Connections______

The Mapletree Audio Design PS 2D power supply provides +12 VDC (regulated) heater
supply voltage and +200 VDC B+ plate supply voltage at a current of 15 mA (see
specifications). It utilizes ultra high-speed diode bridge rectification to achieve low noise
and high efficiency.

The separate power supply eliminates induced hum originating from power supply
circuitry and components. The power connections to the preamplifier chassis are made
through a special 3-conductor power cord that plugs into jacks located on the rear panels
of the power supply and preamplifier chassis.

CAUTION: Do not operate the power supply when it is not connected to the
preamp. Damage of components may result.

Once the interconnecting power cord is securely attached between the two chassis and the
line cord is plugged in, the power supply can be turned on. The pilot lamp on the power
supply chassis indicates that the unit is on. It takes about 30 seconds for the tubes to reach
operating temperature ready for use. During operation, is it normal for the power supply
chassis to become warm to the touch.

The power supply is protected by a 20mm, 1 A/250 V fast-acting fuse, which can be
accessed by removing the fuse drawer from the ac inlet receptacle after the unit has been
unplugged for at least 60 sec. Under normal conditions, it should not be necessary to

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