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MC Head Amplifiers "MC-1"


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Input impedance (ohm) 60 / 94 / 150 Body size

W75 x H155 x D200 mm

Weight 1.1kg

Output impedance 2.5k ohms Power supply size

W200 x H115 x D265 mm

Weight 2.6kg



(about 22.2 times)

Input terminal RCA
Frequency response 20Hz to 120,000Hz (-2dB) Power consumption 5W
Connection cord DIN cord (about 2m)

Heater voltage selector switch

power supply bottom side

Vacuum tube

2x 7586 (exchangeable to 6922 with voltage switching)


<Reasons for creating a tube head amp>

This MC-1 head amp is a tube type, and the audio signal does not pass through resistance.

I think that the parts that degrade the sound quality of an audio system are transistors, transformers, and resistors.

The step-up transformer has a good SN ratio and is the most common MC step-up product in the world.

However, a phase shift occurs between high and low frequencies as a characteristic of transformers.

Considering the phase shift, I feel the limit of the step-up transformer is 20~20kHz.

It was difficult to achieve a high SN ratio with a vacuum tube, so I had a hard time making the MC-1, but I was finally able to commercialize it.

MC-1 has no phase shift and almost no frequency limit.

All products of Miyajima Laboratory are designed so that audio signals avoid these three as much as possible.

By avoiding these three, a Hi-Fi audio system with realistic sound quality is completed.

The MC-1 is the ideal MC head amp.



<Please be sure to read the special specification requirements below.>

There are special conditions for using the MC-1.

Since MC-1 is a one-stage amplification, the phase is reversed.

By inverting ± of the input, the inversion of the phase is returned.

Input inversion inverts the ± signal of the phono cable.

The structure of the high-class phono cable is a two-core wire.

Since the ±2 core wires and the shield are separate, there is no problem even if the ± are switched.

A cheap phono cable may be a single core wire.

Only + 1 core wire, - is a shield.

In this case, the signal cable is exposed when the ± is reversed.

A loud hum is introduced into the audio signal.

Therefore, the condition for using MC-1 is that the shield of the tonearm and the shield of the phono cable are independent.

The structure of the phono cable can be confirmed, but the structure of the tonearm cannot be confirmed.

I think most tonearms are fine, but if you get a lot of hum, use the MC-2.



  • Both low impedance cartridges and high impedance cartridges are supported.
  • Receive with a 50k ohm load impedance amplifier.
  • The chassis, vacuum tube shield sockets, and component boards used in the MC-1 are vintage American parts.
    Therefore, there are scratches, peeling, and white rust.
    It would have been easier to build on a modern chassis, but I took advantage of the charm of this vintage chassis.
    This vintage chassis is limited in number.
    As soon as the vintage chassis is gone, we will make it with a modern chassis.






  • There is a slight white noise of the tube at high volume.
  • The MC-1 occasionally receives broadcasts and illegal radio in wooden buildings, but not in steel buildings.


* Product specifications are subject to change without notice for improvement. Please understand.




Description of each part

Connect the DIN cord from the main unit to the power supply.

Attach the power cord and connect it to the outlet.

Connect the phono cable to the IN of the main unit, and connect the OUT to the MM input of the preamp.

Check the heater voltage switching and turn on the power.


There is an input impedance selector switch in front of the top of the main unit.

We recommend that you receive it at about 10 times the impedance of the cartridge.

Select 150 ohms for Miyajima-lab stereo cartridges and 60 ohms for mono cartridges.

If you don't know the impedance, choose 150 ohms.


In addition to the 7586 vacuum tube, the MC-1 can also use the 6922 vacuum tube (sold separately).

Please use carefully selected 6922.

Remove the metal socket and pull out the tube. Insert the 6922 and cover it with the metal socket.

Be sure to switch the switch on the bottom side of the power supply to 6922.



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