Magnum Dynalab MD90 Analogue FM Tuner - Factory Serviced

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General:
This unit just came back from Magnum where it was serviced. We put some final touches on it and it is now working well.

Silver faceplate was optional and much more rare than black.

The FT101 was first Magnum Dynalab Analogue FM tuner and it launched the brand in 1985. It redefined
sonically what FM could be. The FT101A was a further refined improvement on the original and the
MD90 as the replacement sets a new standard for FM quality. Even though the MD90 is our entry level
tuner it is used throughout North America by radio stations to monitor their broadcasts and for remote relays of FM signals.
Features

- 5 stage tuning
- Toroidal transformer
- Center tune, signal strength and multi-path meters
- Gold plated Sound Connection RCA connectors
- Kimber hyper-pure hook up wire
- Black faceplate

Options
- precision remote control
- balanced output
- silver faceplate
- audio upgrade

Connections:
RCA outputs, coax antenna input, removable IEC power cord.

General Sound:
Smooth, uncolored, undistorted natural and clean

Cosmetic Condition:
7/10 = Good. One or two minor scratches. Well Maintained.. See our detailed rating description here.

Working Condition:
Working perfectly and tested in our lab.

Included:
Unit, manual, and power cord.

Packing:
Will be packed using our highly developed in-house process and custom packing materials.Link to Manual:
Click Here

Recommended Cables:

[Kimber Kable - RCA Interconnects](https://skyfiaudio.com/products/kimber-kable-hero-interconnects-pair-rca-ultraplate-or-wbt-connectors-new) - Better

[Kimber Kable - Power Cords](https://skyfiaudio.com/products/kimber-kable-pk14-pk-14-ascent-power-cord-brand-new) - Better

Testing Process:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR. Vintage analog tuners also have moving parts related to the tuning gang and dial string. These parts are inspected for smooth operation.

If the unit passes visual inspection it is bench tested for a handful of key performance parameters using a Sencore SG80 AM/FM Stereo Analyzer. The SG80 allows us to “simulate” an ideal radio station using precision test signals instead of music. This device, in conjunction with an oscilloscope allows us to properly evaluate the following parameters:

1.  AM Reception (Where Applicable)

2.  FM Mono Reception & Tuning Meter Function

3.  FM MPX Reception (Stereo)

4.  Dial Tracking - How accurately the tuner dial or display indicates the actual frequency of the broadcast being received.

5.  Stereo Separation - A properly working stereo tuner will have minimal crosstalk between the left and right channel.

6.  Sensitivity & Signal Strength Meter Function - By lowering the output of the SG80 we can simulate weak stations and determine how well the tuner will be able to pull in weak distant stations. This adjustment also helps us verify signal strength meter function.

If the tuner has acceptable performance related to the parameters above we connect the unit for listening tests with a simple dipole antenna. We listen for audio reproduction quality of local stations and evaluate how many stations the tuner can receive while we sweep through the dial. We are looking to verify that the tuner can decode stereo on strong local broadcasts and pick up a wide variety of local stations at the bottom, middle, and top of the frequency band. At this point we also test convenience features such as muting, filters, built in oscilloscope function, etc.

We finish up with an extended listening test on our long term test rig. We tune in a strong local station and monitor for drift over a 2-3 hour period.