Mark Levinson No 28 Owners manual
CD
PHONO/
AUX 2
TUNER
AUX 1
INPUT SELECTOR MONITOR SELECTOR RECORD SELECTOR OUTPUT LEVEL
TAPE 1
TAPE 2AUX 3
TAPE 1
MADRIGAL AUDIO LABORATORIES
Nº 28
PREAMPLIFIER
INPUT
MONITORDEFEATTAPE 2
4
3
2
1
OFF
1 2 3 4
Front panel
1 INPUT SELECTOR
Selects one of the seven inputs: CD, TUNER, PHONO/AUX 1, AUX 2,
AUX 3, TAPE 1, or TAPE 2.
2 RECORD SELECTOR
Selects between the program source (selected via the INPUT
SELECTOR), and either of two tape monitor inputs (selected via the
MONITOR SELECTOR).
In the DEFEAT position, the tape outputs are disconnected.
5
6
7
8
9
10
In the INPUT position, the tape outputs are connected while still
monitoring the selected source.
In the MONITOR position, the selected tape machine can be
monitored without affecting the signal at the tape outputs.
Note: Because of the switching arrangement employed in
the Nº28, we recommend that while making a critical
recording you don't operate the RECORD SELECTOR switch.
If you wish to monitor the signal from tape, set the RECORD
SELECTOR to MONITOR and use your tape machine's monitor
switch to switch between input and tape.
3 MONITOR SELECTOR
When the RECORD SELECTOR is in the MONITOR position, this selects
between the TAPE 1 and TAPE 2 inputs.
4 OUTPUT LEVEL
Adjusts volume at the main outputs.
The OUTPUT LEVEL control doesn't affect the tape outputs.
1
BALANCED MAIN
RIGHT LEFT
MAIN
TAPE 1
TAPE 2
POWER
SUPPLY
INPUT
CD
RIGHT LEFT
PUSH PUSH PUSH PUSH
AUX 2
RIGHT LEFT
INPUTSOUTPUTS
LEFT
GND
TAPE 1
TAPE 2
AUX 3
TUNER
AUX 1
PHONO/
RIGHT
7
PRECAUTION
3
2
1
4
568
Rear panel
Disconnect all associated equipment from the AC mains BEFORE
making any signal connections and applying power to the Nº28.
Note: All left-channel RCA-type inputs and outputs are at the top of
the rear panel, and all right-channel RCA-type inputs and outputs are
at the bottom of the rear panel.
1 PHONO/AUX 1
If your Nº28 is equipped with the phono option, connect your
turntable's right-channel and left-channel signal leads to these
inputs. Connect the tonearm ground lead to the GND binding post
next to the inputs.
If your Nº28 isn't equipped with a phono option, these inputs will
accept signal leads from any line-level source equipment.
2 TUNER
Accepts right-channel and left-channel signal leads from a tuner
or other line-level source equipment.
3 AUX 3
Accepts right-channel and left-channel signal leads from line-level
source equipment.
4 TAPE 1, TAPE 2 (INPUTS)
Accept right-channel and left-channel signal leads from the tapeoutput connectors of a tape machine. These inputs can also be
used with other line-level source equipment.
5 AUX 2, CD
Accept right-channel and left-channel balanced signal leads from
a CD player or other source equipment with balanced output.
The pin assignments of these XLR-type female input connectors
are:
PUSH
21
3
Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
2
Refer to the operating manual of your balanced-output line-level
source to verify that the pin assignments of its output connector
correspond to the Nº28. If not, wire the cable so that the
appropriate output pin connects to the equivalent input pin.
Note: If you won't be using the Nº28's balanced inputs and
need more single-ended inputs, it's possible to fabricate a
cable to connect line-level sources with single-ended output
to these balanced inputs:
Male RCA
(connect to
source)
22-guage
buss wire
1
3
Male XLR
(connect to
2
Nº28)
6 TAPE 1, TAPE 2 (OUTPUTS)
Connect these outputs to the right-channel and left-channel tape
inputs of your tape machine.
These outputs are unaffected by the OUTPUT LEVEL control on the
front panel of the Nº28.
7 MAIN
Connect these outputs to the right-channel and left-channel
inputs of your power amplifier or electronic crossover.
These outputs are affected by the OUTPUT LEVEL control on the
front panel of the Nº28.
8 BALANCED MAIN
If your power amplifier is equipped with balanced input
connectors, it's best to connect it to the Nº28 via these connectors,
particularly if long cable lengths are required.
Connect the right-channel and left-channel BALANCED MAIN
outputs of the Nº28 to the appropriate balanced inputs of the
power amplifier.
The pin assignments of these XLR-type male outputs are:
Pin 1: Signal ground
12
3
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
Refer to your power amplifier's operating manual to verify that the
pin assignments of its input connector correspond to the Nº28. If
not, wire the cable so that the appropriate output pin connects to
the equivalent input pin.
3
Unpacking and placement
Unpacking
Placement
Ventilation
PRECAUTION
Unpack your Nº28 Preamplifier and keep all packing materials for
future transport. Locate and remove all accessory items from the
cartons.
Carefully inspect the product for damage and flaws. If you find any,
see your Mark Levinson dealer immediately.
Place the Nº28 as close as possible to the source equipment, thus
keeping interconnect cabling as short as possible. It may be placed
on a shelf or in a cabinet where it's convenient to operate.
A two-meter DC cable is provided to connect the PLS-228 to the Nº28.
This allows you to place the PLS-228 so that it won't induce hum in the
Nº28 and other sensitive components. Other associated equipment
should also be placed so that it doesn't induce hum in the Nº28 and
other sensitive components.
Be sure to allow 3 to 4 inches of clearance above both the Nº28 and
the PLS-228, to allow heat dissipation through air circulation.
Mechanical drawings are included in this manual to facilitate special
installations and custom cabinet work (see "Dimensions").
For your protection, review "Important safety instructions" before you
install your Nº28.
4
Voltage selection
The PLS-228 is factory-set (internally) for 100V, 120V, 200V, 220V, or
240V AC mains operation @ 50 or 60Hz. Make sure that the label on
the bottom of the PLS-228 indicates the correct AC operating voltage
for your location.
PLS-228 bottom-panel
label
PLS-228 POWER SUPPLY
AC INPUT
Voltage
indication
WARNING:
OPERATE THIS DEVICE, REFER TO
OWNER'S MANUAL FOR PROPER
OPERATING INSTRUCTIONS AND SAFETY
PRECAUTIONS. HAZARDOUS VOL T AGE
AVAILABLE INSIDE; DISCONNECT AC~
MAINS CABLE BEFORE REMOVING COVER.
MAINS
FUSES:
BEFORE ATTEMPTING TO
OPERATING VOLTAGE:
90 – 110VAC~
105 – 125VAC~
180 – 220VAC~
100 – 120VAC~
2A SLO–BLO 250VAC 3AB
200 – 240VAC~
1A SLO–BLO 250VAC 3AB
SERIAL NO.
DESIGNED AND MANUFACTURED IN U.S.A. BY
MADRIGAL AUDIO LABORATORIES INC.
210 – 240VAC~
230 – 250VAC~
~50 – 60HZ
If the voltage indicated is incorrect, see your Mark Levinson dealer.
If you wish to change the AC operating voltage of the Nº28/PLS-228,
see your Mark Levinson dealer.
The Nº28/PLS-228 can be powered by a normal 15-ampere AC mains
line. If other devices are also powered from the same AC line, their
additional power consumption must be taken into account.
5
Set-up and installation
Connectors and cables
Internal adjustments:
line gain
The Nº28 incorporates RCA-type and XLR-type connectors for audio
signal input and output.
The Madrigal-designed RCA-type connectors used for single-ended
audio interconnection are a great improvement over ordinary RCAtype connectors. The gold-plated XLR-type connectors employed are
of European design, and are made to professional application
standards.
When connecting the Nº28 to source equipment and power
amplifiers, we recommend Madrigal Audio Laboratories HPC
Interconnect Cable. HPC is available in various lengths, terminated
with RCA, XLR, and Camac connectors. See your Mark Levinson
dealer for more information.
The Nº28 offers internal gain adjustment of the line amplifiers, in 6dB
steps via two single-pole miniature rocker switches. These switches
have been factory-adjusted at 6dB/single-ended and 12dB/
balanced operation. In practice, you should have enough gain so
that normal listening is possible with the OUTPUT LEVEL set at
approximately 6.
If you wish to increase the line gain, see "Making the internal
adjustments;" refer to the table below for the proper switch positions
for each gain setting.
Line gain settings
Internal adjustments:
phono gain
Phono gain settings
(high-gain option)
Phono gain settings
(low-gain option)
Switch Gain
#1 #2 Single-Ended Output Balanced Output
Off Off 18dB 24dB
Off On 12dB 18dB
On Off 6dB 12dB
On On 0dB 6dB
The Nº28 is available with either a high-gain or low-gain phono option.
Each option offers two internally adjustable gain settings via two
single-pole miniature rocker switches, one for each channel. The highgain and low-gain phono options have been factory-adjusted at the
lowest gain settings (58dB and 38dB, respectively).
If you wish to increase the gain, see "Making the internal adjustments;"
refer to the tables below for the proper switch positions for each gain
settings.
Switch
#1 #2 Gain Nominal Cartridge Output (3.54 cm/sec)
On Off 58dB .2mV - .6mV
Off On 64dB .2mV and Lower
Switch
#1 #2 Gain Nominal Cartridge Output (3.54 cm/sec)
On Off 38dB Greater than 2.0mV
Off On 44dB 2.0mV and Lower
6
Loading...