Introduction; Power Supply Connections - Mapletree Line 2B SE User Manual

Introduction

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The Mapletree Audio Design Line 2B SE Stereo Line Preamplifier is part of the MAD
Modular Series of preamp/power supply components. It offers the audiophile a number of
desirable features:
? ? Compact chassis layout for use with separate power supply for low noise.
? ? Exclusive use of NOS 12SN7GT octal tubes, known for low distortion and
musicality.
? ? Heater voltage switch for use of 6SN7GT tubes if desired.
? ? Low output impedance (less than 500 Ohms).
? ? Parallel output jacks.
? ? User-specified gains of from 0 to 22 dB.
? ? Premium Auricap polypropylene film signal coupling capacitors.
? ? Alps volume control.

Power Supply Connections______

The Mapletree Line 2B SE consists of a preamplifier chassis with a separate power
supply. This allows separation between the two units and eliminates induced hum
originating from power supply circuitry and components. The Mapletree PS 2 or PS 2a
power supplies provide 12 VDC (regulated) at 0.6 A for the heater supply and +200 VDC
at full load (12 mA) for the B+ plate supply. The PS 2a has dual power outputs that allow
the Phono 3 phono preamp to share the power supply with the Line 2B. The power
connections to the preamplifier chassis are made through a special power cord that plugs
into jacks located on the rear panels of the power supply and preamplifier chassis. This
manual refers to the PS 2 power supply. Operation with the PS 2a is identical.
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 toggle switch on the front panel of the PS 2 is used to activate
the power supply. The pilot lamp indicates that the unit is on. It takes about 30 seconds
2