6
if you are facing the front of the unit).
C.
OUTPUTS
The HA-3000 is equipped with one pair of single-ended
(RCA) outputs (see Figure 1). The right and left channel
output connections are the top pair of RCA connections,
above and to the left and right of the ground connection.
The left channel output connection is on the right of the
unit, facing the HA-3000’s rear panel (on the left if you
are facing the front of the unit). The right channel output
connection is on the left of the unit, facing the HA-3000’s
rear panel (on the right if you are facing the front of the
unit).
Power
Be sure the HA-3000 power supply power button switch
is in the “off” position (“out”- not depressed) before
connecting the IEC equipped power cord to the rear of
the power supply. The HA-3000 power supply unit uses a
standard IEC AC connection (see Figure 3). The DC
umbilical cable to the pre-preamplifier unit is fixed to the
rear of the power supply and connects to the rear of the
pre-preamplifier unit. The umbilical cable must be
inserted snugly into the connector on the rear of the pre-
preamplifier unit and then secured, using the screw collar
around the connector (see Figure 1).
OPERATION
Be sure you have turned the volume down or otherwise
muted your preamplifier before connecting the HA-3000.
Also, make sure all your connections are snug.
At this point, if you have not already done it, turn the
front panel load selection control knob to the loading
factor that you think will work for your moving coil
cartridge.
The HA-3000 has four input load impedances: 50, 100,
200, and 500 ohms, selectable from a control on the front
panel. Please see Figure 2.
You may need to experiment
with different load settings to find the one best suited
for your cartridge.
Turn on the HA-3000 by pressing down the button on the
front panel of the power supply unit to the “on” position.
The running LED on the front of the pre-preamplifier unit
will illuminate.
From this point on, operation is straight-forward. Of
course, always be sure you have turned the volume down
or otherwise muted your preamplifier before changing
loads with the front panel control.
In the case of any failure, please contact Hammertone
Audio.
SPECIFICATIONS
FOR THE ALLNIC AUDIO HA-3000 HEAD AMPLIFIER
Inputs:
MC (Moving Coil – unbalanced
(RCA) × 1 pair
Outputs:
Unbalanced (RCA) × 1 pair
Ground: Screw Type x 1
Frequency Response
Range :
15KHz to 30KHz, flat
Voltage gain :
30 dB
S/N Ratio :
More than -100 dB (CCIR)
Tubes:
Pre-preamplifier:
2 x Nuvistor 7895 (equivalent
6CW4)
Power Supply:
2 x 7233 (no equivalent); 2 x
6BH6 (equivalent CV 3908)
Maximum Input Voltage: 530mV (20Hz ~ 20KHz) Non-
Clipping
Input Load Impedances: 50, 100, 200 and 500 Ohms
selectable
Dimension and Weight
(each unit):
215mm(W) Ⅹ 290mm(D)
115(H)
Weight Pre-preamplifier
unit:
2.5Kg (5.5lbs)
Weight Power supply:
5.8Kg (12.7 lbs)
AC Power Requirement : 120/220 VAC - 50/60Hz
(depending on factory setting)
