8
You will need to experiment to find the “sweet spot”
combination for each MC cartridge because even the
cables from your cartridge to the tonearm, your
internal tonearm cable, and your phono cable will all
affect impedance level. We suggest starting with the
specifications from your cartridge and using the
impedance level closest to that. Please refer to Table
one to see the possible combinations for MC cartridges
and the resulting operating impedances and gain.
In the Specifications section, you will read that the MC
input impedance for the H-3000V is up to 470 ohms.
This value represents the internal impedance of the
cartridge itself and is at the very extreme of what
would normally be expected for the internal impedance
of an MC cartridge.
G.
PHONO EQUALIZATION CONTROLS
The H-3000
V
’s phono equalization curve controls, of which
there are two pairs, one for each channel, are on top of the
transformers located just in front of the Moving Coil
transformer controls (See Figure 6). Use the rotary knobs to
set the equalization for each record. The RIAA standard,
which is used for most records, is a Turn-over of 500 Hz and
Roll-off of -13.7 dB; this standard is indicated for each control
knob (See Figure 7). Be sure to set the controls identically for
both channels. A selection of some of the more common
possible non-RIAA settings are found in Table 2 of this
Manual.
H.
A NOTE ON PHASE
Phase issues generally will result in lack of bass and/or
focus of the stereo image. You may need to reverse
connections on your cartridge if you are having phase
issues. As is usual in these circumstances, some trial and
error experimentation may be required to find the
correct position. The process is simplified for you with the
H-3000
V
, as it has a phase control switch on the front
panel of the phono stage unit.
INITIAL POWER-ON
Once you have your H-3000
V
in place, you have installed
the5AR4 rectifier in the power supply unit and replaced the
top of the unit, and all connections have been made to your
turntable and preamplifier, you are ready to turn on the power
for your H-3000
V
.
Before you power up the H-3000
V
, though, be
sure you have:
removed the shipping O rings from the tubes.
selected the output connections that you want to use, single
ended (RCA) or balanced (XLR), on the two switches on the
back of the phono stage
turned the volume down or muted your preamplifier
pressed the button switch on the left hand side of the front
panel of the phono stage, labeled “muting” below and
having button in and out icons for operate and mute,
respectively, to the in/down “mute” position (see Figure 3)
pressed the button switch on the right hand side of the front
panel of the phono stage to the appropriate phase position,
either “normal” (pressed in) or “inverted” (out position). We
suggest starting with “normal”.
rotated the knob labeled “input selector” to the appropriate
input, corresponding to the input you will use initially (See
Figure 4), either MC1 or MC2, or MM1 or MM2
if you are using a moving coil cartridge, set the MC
transformer controls on the top of the chassis to the factor
that you will try initially
set the Phono Equalization controls for both channels for the
setting for the first record you will use
checked that all your connections are snug
To turn on the H-3000
V
, press in the button switch on the front
of the power supply marked with on and off icons (see Figure 4).
Of course, the off position is the reverse, pressing the button
again so it is returned to the maximum raised position.
OPERATION
When the power supply is on, the light on its front panel
will illuminate and, if it is in the “operate” position, the
light above the muting switch on the front panel of the
Allnic Audio H-3000
V
phono stage will illuminate after a
forty (40) second automatic protective “mute” period. The
light above the phase switch will illuminate as well, if the
switch is in the “normal” position at turn on.
To avoid surges to the speakers, it is best to switch between MM
or MC input, or between inputs 1 and 2 of either, only with the
H-3000
V
in “mute” mode and with your preamplifier volume
down or otherwise muted.
