Magnum Dynalab MD-108 User Manual

MD 108

HYBRID FM TUNER

INSTRUCTION MANUAL

TABLE OF CONTENTS

Dear Valued Customer 3

Unpacking your MD 108 4

Control Functions 5

Front Panel Display 6

Installing the MD 108 7

Rear Panel Display 8

Tuner Remote Controls 9

Troubleshooting 11

Reception Techniques 12

FM Reception Aids and Accessories 13

Product Specifications 14

Safety Sheet 15

Limited Warranty 16

2

Dear Valued Customer,

Thank you for choosing the Magnum Dynalab “MD 108” Hybrid FM Tuner, our finest FM tuner.
Great care has been given in the design, manufacturing and selection of components for the “MD
108” Tuner in order to ensure many years of listening enjoyment.

The MD 108 is the culmination of years of research and development. We have expended
considerable effort at every phase of the design process to achieve the highest level of
performance. We have also used only the finest components throughout the unit. For example,
special mu-metal transformers for the RF section, as well as a separate large torroidal
transformer for the audio stage, were chosen because of their high performance characteristics.

We appreciate your decision to purchase the MD 108 FM tuner. Please feel free to contact us if
you have any comments or suggestions on improving your FM listening experience. Call us on
our toll free number, 1-800-551-4130 or contact us via email at: [e-mail].
We at Magnum Dynalab are here to serve your FM needs.

Respectfully yours,
Larry Zurowski

President

3

UNPACKING YOUR MD 108

Carefully inspect all sides of the shipping carton for damage. If there are marks or holes in the
carton make note of the location in relation to the unit inside. Any obvious dents or scuff marks
should alert you to the possibility of damage. Open the top flaps and carefully lift the transport
case out of the carton. Carefully remove the MD 108 from the end caps and wrapping, inspect all
sides. Pay special attention to the corresponding areas on the unit where damage was found to
the shipping carton. If damage is evident, document the type and extent of the damage, then
repack the unit and call the dealer.

If your unit was delivered by a common carrier (Eg. UPS) and you have found it to be damaged,
contact the carrier immediately for instructions.

KINDLY DO NOT SEND THE UNIT BACK TO THE SHIPPER UNTIL YOU HAVE
BEEN ASKED TO DO SO. SHIPPNG THE UNIT BACK PREMATURELY MAY VOID
ANY CLAIM FOR DAMAGE THAT YOU MAY HAVE.

DO NOT DISCARD THE PACKING MATERIALS AND CARTONS. Should there be a
necessity to return the unit for any reason, it must arrive safely and suitably packaged in order for
our receiver to accept it from the carrier. Also, if the unit has incurred damage as a result of
improper packaging, it is not likely that a claim for the damage against the carrier will be
successful.

Likewise, we will ship your unit back to you only in factory-approved packaging, However, if
the unit were to arrive at the factory on anything other than factory approved packaging, we
reserve the right to return same in factory-approved packaging and charge the cost of the
packaging to the shipper. This is the only way we can assure you of a safe return (damage by
carrier excepted).

4

CONTROL FUNCTIONS

The front panel controls consist of the following functions (See the Front Panel Display
illustration on the following page):

POWER: Controls the power to all display functions. All functions are kept in stand-by mode.

Any LEDs on the front that are lit will stay lit.

MUTE: Controls the elimination of inter-station noise. It is recommended that, when receiving

marginal signals, the mute be set to off. This will eliminate intermittent loss of signals
that fall below a specific signal value. The LED located above the station selector knob
indicates when the mute is activated.

STEREO: Controls whether the tuner is operating in Stereo or Mono mode. The LED located

above the station selector knob indicates when the tuner is operating in stereo.

BW1: Controls the IF super narrow setting. This setting should only be used in extreme

reception conditions of adjacent channel problems.

BW2: This setting combines excellent frequency response with high adjacent channel selectivity.

BW3: Controls the ultra wide IF setting and offers the best frequency response.

Note: One of the BW switches must be on for the tuner to operate.

BLEND: In the “ON” mode, the stereo signal strength is sampled continuously in the Blend

monitor circuit. Should the signal strength fall below the level required for full quieting
with maximum stereo separation, the blend circuit will automatically narrow the stereo
separation proportionately to minimize the noise that might otherwise be generated in
the multiplex circuit.

DIM: Used to extend the life of all display components especially the magic eye by reducing

their intensity.

TUNING KNOB: Rotating this control drives a precision ten turn potentiometer that selects the

desired frequency.

METER: The left hand meter displays multi-path, see the section on Reception Aids. The right

hand meter displays signal strength. The higher the reading, the better the reception.

CENTER TUNE MAGIC EYE: Provides a visual display for fine tuning the frequency to

maximize stereo separation and minimize noise. Tune the unit to minimize the shadow
(the light green area). Use the Magic Eye in conjunction with the signal strength meter
to achieve the best response.

FREQUENCY DISPLAY: Displays the frequency that you are tuned to.

5