Luxman MQ-70 Stereo Tube Amplifier - 220V

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The MQ-70 is a 45W stereo tube amplifier made by Luxman, the renowned Japanese audio company.

It was handmade in Japan from the highest quality materials of the time, and especially benefits from the quality of the transformers which contribute to its lush warm dynamic sound quality.

Luxman tube amps from this era are a rare find in the US.  Most were sold overseas and kept in the Asian market.  You can buy them from Japanese websites, but it will cost you an arm and a leg (especially in shipping) and may not be the correct voltage.

This is a 220V version that has been well cared for and babied.  It was part of a large collection that we just purchased from a local collector which included dozens of amplifiers.  So you can imagine how little use it actually saw.

The MQ-70 was designed to run on common EL34 or 6L6GC tubes. This example is loaded with EL34 tubes that are in great shape and that test strongly in our workshop. I suspect there are many years left in them.

Overall physical condition is good, but there are a few light scratches or scuffs throughout. There is no grill cover/tube cage.

On the back you'll find gold plated binding posts and RCA jacks, as well as variable input potentiometers.

This amplifier is in perfect working condition with the tubes testing strong and clean. We ran the unit on our workbench to its full rated power and it measured without issue or noise.

It was also tested in our listening room for a solid period of time to ensure that what our test equipment reported translated to good quality audio.

This is a rare and beautiful unit and is priced accordingly. No lowball offers please.

If you need a recommendation for a 220V step-down transformer for your use, simply contact us and we'll be happy to assist.

Our Testing Process for Amplifiers (Tube) at SkyFi:

We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and tubes are inspected for signs of stress overheating or cracking.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If it all looks clean we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier the remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will also be tested.

We also test all tubes for output gain and leakage on our calibrated B&K 747 tester against the original manufacturers specifications. If needed, the tubes will be replaced from our vast NOS (New Old Stock) vintage or modern inventory.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage Kef speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.

Technical Specifications:

POWER OUTPUT:
45 watts per channel RMS into 8 or 4 ohm loads at any frequency from 25Hz to 30kHz

T.H.D.:
Less than 0.1% (1kHz at 10 watts into 8 ohms), no more than 0.5% (1kHz at rated power output into 8 ohms)

FREQUENCY RESPONSE:
10Hz~40kHz (-1 dB)

INPUT SENSITIVITY:
650mV

INPUT IMPEDANCE:
80k ohms

S/N RATIO:
better than 110 dB (input shorted, IHF-A weighted)

CONTROLS:
input Level Controls for each channel

VACUUM TUBE COMPLEMENT:
6CA7 (four), 6240G (two), 12AX7 (two)

OUTPUT TRANSFORMERS:
OY-15-6.5KHP High Power Type (two)

POWER CONSUMPTION:
190 watts

DlMENSIONS:
405(W) x 165(H) x 240(D) mm (16.0" x 6.5" x 9.5")

WEIGHT:
17.0 kgs (37.4 Ibs.)

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.