MEITNER PA6i PREAMPLIFIER
Few Words on Design Philosophy from Edmund Meitner...
- No Mechanical
There are no mechanical switch contacts in the critical audio path. All audio
routing is achieved by logic controlled, current mode MOSFET devices. This
assures that no frequency modulation distortion or dioding can occur due to
the presence of audio voltages. Voltage controlled amplifiers in each channel
eliminate noise, distortion and discontinuities associated with mechanical
volume and balance controls.
- Remote Control
In my experience as a listener, the ideal location for all adjustments of
the preamplifier is from the listening position. We have therefore included
a remote control that allows you to control or change volume, balance, absolute
phase and mode selection from your listening position. No audio signal is
present at the remote, only DC control signals.
- Why Absolute
When switching from one source to another and even from one record to another,
we noticed that the absolute phase was constantly being changed. Some records
in fact recommended that you reverse absolute phase by actually reversing
both speaker connections. The absolute phase switch allows you to make these
changes from your listening position.
- Output Protection
Any fully DC controlled system presents a potential problem with DC offset.
At the main output of the PA6i, a relay limits the DC offset and excessively
low frequencies. As the relay is out of the audio path when activated, the
"on/off" thump is eliminated without any degradation of the audio
- Phono Input
We have two interchangeable phono input modules that will allow you the flexibility
of using the vast majority of phono cartridges available.
- No Coupling
There are no coupling capacitors in the PA6i from input to output. In our
opinion, any capacitor is a compromise.
- Charge Biasing
We have introduced a unique circuit to charge bias critical areas of the PA6i
circuits. This is one of the most significant improvements introduced since
the original PA6 was designed.
the unit from the box, please ensure that it contains the following:
- Meitner PA6i
- Wire or Infra-red
- Power Supply
with connection cords attached
- Phono Module
- Owner's manual
& brochures etc.
the wood boxes for any defects in finish which may have occurred in transit.
Each unit was hand finished and examined prior to shipment.
- At the back
of the PA6i there are two DIN type connectors for the power supply and the
remote control. Both are clearly marked. Plug in both units prior to connecting
the power supply to the AC outlet.
- As soon as the
power supply is plugged in and turned on, the "mute" indicators
on both the preamplifier and the remote will flash for approximately twenty
seconds. When the flashing stops, the unit is ready for operation.
- Connect the
various inputs as indicated on the back panel of the PA6i. There are two pairs
of power amplifier outputs. Both of them are identical. Connect your power
amplifier to either of the two pairs of outputs. The additional pair of outputs
can be used , as required, to power bi-amplify appropriate speakers or to
drive a subwoofer.
- The front panel
has only one control. This is a soft-touch mute switch and is recessed to
be unobtrusive. When lightly pressed, the "mute" square activates
the muting circuit which reduces the main output by 25 dB to facilitate record
changing and other interruptions. This function is repeated on the remote
Phono Input Module
- There are two
options available in the form of plug in modules. These will accommodate most
of today's cartridges. Your PA6i comes with the module you ordered and you
can order the other through your dealer.
- Input Selection
- Press the desired input selector and the appropriate light on the remote
control and/or the front panel will indicate the input selected.
- When this is pressed, it activates the tape monitor circuit. You can select
any one of the sources and the tape monitor switch depending on the source
your wish to record from. One of the source inputs will also remain selected
along with the tape.
- As discussed above, this reduces the main output by 25 dB. When this switch
is activated and the volume control is turned down fully counter clockwise,
the output protection relay is engaged. This facilitates a full mute condition.
The mute has a "ramp" function that increases or decreases volume
over a one second interval. When the volume control is at the lower 20% of
its range and mute is engaged, output will be muted 100%.
- Activating this switch reverses the absolute phase; It simulates the effect
of reversing the speaker leads on both channels. Some music sources are recorded
with the absolute phase reversed. If the record sleeve does not specifically
indicate this, use the normal position to start with. Experiment with this
function from your normal listening position and select the phase offering
the greatest clarity and most realistic presentation of sonic images.
- Balance and
Volume - The volume control works in the traditional manner. The balance
functions as a stereo pan control. As the level in one channel in increased,
the level in the opposite channel is decreased. This allows you to move the
sound "stage" to the left or right without changing the overall
loudness in the room.
- The IR. system
is comprised of two pieces; the IR. receiver unit and the IR. hand control.
The IR. system eliminates the wire attaching the hand control to the preamplifier.
It will also permit the PA6i to be used with many of the "smart"
unified remote controls or infra-red link systems available.
- The IR. control
offers all the control functions of the wired version, with the addition of
a button positioned between "Balance Left" and "Balance Right"
that, when pressed, will restore the balance to the center.
- Unlike most
IR. controls wherein the adjustments in level from one setting to the next
are too coarse (i.e. too soft or too loud), the adjustment "steps"
of the PA6i are in 0.25 dB increments. Thus the resulting changes in volume
and balance are smooth and continuous.
- Additional installation
documentation on the IR. control can be found in the IR. control package.
- There are three
trim pots to adjust the gain of phono, tuner and AUX/CD relative to the tape
input and relative to each other. Access to the trim pots is through three
holes on the metal top chassis panel. The wooden sleeve can be removed by
removing the two screws at the bottom of the unit. Each trimpot can then be
used to adjust input sensitivity for the corresponding input. Phono, Tuner
and CD/AUX can be adjusted relative to Tape, which is fixed. If Tape is not
used, two inputs can be adjusted relative to the third.
- There are four
jumpers provided for adjusting low frequency response. Access to the jumpers
is through two rectangular openings on the top panel. The options are as follows:
- 1 Hz response
....... no jumper.
- 3 Hz response
....... All four jumpers installed.
- For normal operation,
we would recommend that you leave the PA6i as adjusted at the factory. Should
you have any particular problems with the low frequency area due to turntable
or speaker inadequacies, we recommend that you contact your dealer or our
service department directly prior to making any adjustments.
We offer a choice
of two user changeable phono interfaces which plug into the rear of the PA6i.
The modules are:
Suitable for low and medium output cartridges of moving coil design.
- Voltage Mode
Suitable for high output moving coil and all other high output cartridge types.
The MC interface
requires no load adjustment by the user, as the interface is dynamically load
adjusting. There are user adjustments available for gain and RF interference.
The MMLZ interface
should be used for cartridges of approximately 1.2 mV or greater; including
high (not medium) output MC's and Moving Magnets. This interface provides user
adjustments for gain, resistive load and capacitance. Adjustments are clearly
labeled on the MMLZ interface.
The power supply for the PA6i must of OFF. Remove the two black thumbscrews
and any cables connected. The interface can then be removed by pulling straight
back and out. To replace the interface, re-insert it into its "dock"
checking that the edges of the interface circuit board are positioned in the
nylon side channel guides provided. If the interface is positioned correctly,
it will be re-inserted with a minimum of force.
CAUTION: If the interface does not "seat" easily, remove
it and check that it is in fact in the side channel guides. Re-insert into
the guides and install. Replace the thumbscrews, then turn the PA6i power
supply on. NEVER FORCE THE INTERFACE. If it does not seem to
seat correctly when installed with appropriate care, consult your dealer or
Note: Please ensure that your turntable is properly grounded using the chassis/turntable
grounding terminal provided below the plug in module.
Few Last Words from Edmund Meitner and the Technical Staff at Museatex...
We believe that
you possess one of the finest preamplifiers presently available, irrespective
of price. To obtain the optimum performance from the unit, we recommend that
you give consideration to the following:
- We recommend
that you do not switch off the power supply at any time after the unit is
installed. The only exception is when you are plugging in new equipment, changing
phono modules, etc. The current consumed by the unit is negligible and leaving
the power on ensures that the unit is at optimum performance temperature at
- In the event
of a power outage, the PA6i will turn off. When the power is restored, it
will "wake up" in mute, with no input selected. This ensures that
no problems arise from power on.
- In the event
of a "brownout", or low power condition, the PA6i will go into protection.
The indicator lights will flash and there will be no output. If this occurs,
turn off the power supply until normal power is restored. Turning on the PA6i
will then act as a reset.
examine and clean all contacts with pure isopropyl alcohol and a clean cloth.
Once every month or two is recommended for best performance.
- Auxiliary equipment
used must be of the highest quality to benefit fully from the PA6i. We would
obviously recommend that you use the PA6i with the Meitner amplifiers, speaker
cables and with our own CD player, turntable and tuner, which will be available
- Please feel
free to contact us if you wish to discuss this or any related aspect of installation
For more information
please contact John Wright at (403) 968-1400 or email firstname.lastname@example.org