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.
PSX
Power Supply
2
