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The MQ-300 is a stereo power amplifier with a single configuration 8W + 8W output. The highly reliable TA-300B (manufactured by Takatsuki Electric Industry Co., Ltd) is used as the output tube for the MQ-300 and is the only output tube that is made in Japan. The configuration of the driver section is 6SN7GTB (manufactured by TungSol) two-stage parallel connection and the output section is the direct heated triode TA-300B non-feedback single power stage connection. This results in a natural and attractive tonal quality with rich musicality that is characteristic of the TA-300B. A cathod-bias type is used for the output stage which has less change in characteristics due to heat or voltage fluctuation. The DC-ignition method for heaters that suppresses hum generation is used for the 6SN7GTB and TA-300B ensuring sound quality and durability.
The orient cut-core large capacity output transformer with aligned magnetic fields as part of the output section supplies stable energy to the whole audio band even at the maximum power level. The logo nameplates inlaid on the top of the casings and the structure that is reminiscent of the classic OY type transformer produce a design with impact.
The Sovtek indirectly heated tube, the 5AR4 is selected as the rectifying tube, featuring low internal impedance and excellent regulation resulting in the gentle start-up of the power supply and thereby prolonging the life of the vacuum tube. A highly reliable TUNG-SOL 6SN7GTB that can withstand a high voltage load is used for the voltage amplifier tube.
| Rated output |
8W + 8W (4Ω, 8Ω,16Ω) |
| Input sensitivity |
490mV (8Ω) |
| Input impedance |
240kΩ |
| Frequency response |
20Hz to 20kHz (+0.3,-1.5dB)
10Hz to 30kHz (+0.3, -3.0dB) |
| Total harmonic distortion |
1% (1kHz, 8Ω, 1W) |
| S/N ratio (IHF-A) |
105dB |
| Circuiting system |
Driver: Parallel connection two stage amplification
Output: Single configuration, cathod-bias circuit
Whole: Non-feedback amplification |
| Vacuum tubes |
5AR4(SOVTEK) x 2
6SN7GTB(TUNG-SOL) x 4
TA-300B(Takatsuki) x 2 |
| Power voltage |
230V~(50Hz) / 115V~(60Hz) |
| Power consumption |
190W
190W (at no input) |
| External dimensions |
460(W) x 237(H) x 340(D) mm
rear side terminal of 36mm included in depth |
| Net weight |
29.0kg (main unit) |
| Accessories |
Power cable |
| Speaker terminal Supported Y-lug terminal dimension |
Width of part a: 16mm or less
Width of part b: 7mm or more
* Connection may not be performed
depending on the shape of the
Y-lug terminal. |
