Introduction; Power Supply Connections - Mapletree Phono 3E User Manual

Introduction

The Mapletree Audio Design Phono 3E Phono Preamplifier is the companion phono
preamplifier to the Line 2 family of line preamplifiers. The features of the Phono 3E
include:
 Compact chassis layout with separate PSX power supply, or designed to share the
Line 2 power supply (PS 2D).
 Low output impedance (<2.5K).
 RIAA equalization within 0.5 dB, 20 Hz – 20000 Hz.
 Use of polypropylene film signal coupling capacitors.
 40 dB gain suitable for all MM cartridges when used in conjunction with a line
preamp with at least 10 dB gain.
 Selector switch for two separate phono inputs.

Power Supply Connections_______

For operation with a separate line preamp other than the Line 2 family, a headphone
amplifier or an integrated amplifier, the Phono 3E can be supplied with the PSX power
supply, which provides high voltage (B+) and DC heater voltage (A+) for the preamp.
The physical separation of amplification and power supply units eliminates induced hum
originating from power supply circuitry and components. The PSX provides 12 VDC at
0.6 A for the tube heaters and 200 VDC at 15 mA for the B+ plate voltage. A power
interconnect cable provides power from the PSX to the Phono 3E chassis ("Power In"
jack). The power switch on the Phono 3E should remain in the ON position when using
the PSX power supply.
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PSX Power Supply
2