Phono Equalizer Amplifie C3EQM2

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Silence born without all noise

High silence with vacuum tube and battery drive

Equipped with ultra-high reliability tube C3g

C3gR.jpg Equipped with ultra-reliable pentode C3g developed by Deutsche Telekom and used for telephone repeaters. Since the grid lines are thin and the distance between the electrodes is large, voltage amplification with high linearity can be performed. In C3EQM2, C3g is soldered directly to the board without using a socket, thereby suppressing noise generation at the contact point.

Completely separated from AC line by battery drive

Various noises are mixed in the AC line, and it enters from the inside and outside of the audio system via cables such as current distortion and electromagnetic noise. C3EQM2 is driven by a large nickel metal hydride battery and completely separated from the AC line. Amplifies the current generated in the cartridge to the level required by the preamplifier without adding any extra current.

● Battery operating time 5 hours (9 hours with optional expansion)

● Charging time 4 hours (8 hours with optional expansion)


Built-in MC transformer


Because the MC transformer is built in, MC cartridges can be amplified simply by connecting a phono cable. In addition, the output is separated from other devices by a transformer system, and it is not easily affected by noise. Since the high permeability super permalloy core is used for a transformer, a very small signal is passed as it is, and the characteristic with high linearity has been acquired.

Switching power supply and analog power supply

In the case of the transformer method, mechanical vibration and magnetic flux generated by the transformer are issues, but C3EQM2 uses a switching power supply that does not have that risk. The voltage stabilized by the switching power supply is further swiftly responsive, and a high-accuracy analog power supply is arranged independently on the left and right sides to make it clear.

Further evolution with various inputs and outputs

Added MM2 input

C3EQ was exclusively for MC cartridges, but C3EQM2 also supports MM cartridges. Equipped with a total of 3 inputs with 1 MC and 2 MM. Built-in MC transformer allows direct connection to the MC terminal. Also, by adding and connecting an external MC transformer to the MM terminal, you can use the MM 2system for MC cartridges.

Added XLR balanced output

C3EQM2 is equipped with RCA input / output and XLR input / output. Coupled with MC / MM cartridge compatibility, expandability with arms and connected devices has increased.

Key technology is no NFB

A negative feedback circuit was invented in 1927, and the performance of the amplifier improved markedly. However, looking at the micro level, the negative feedback circuit (servo control) returns underexposed signals back to the "+" and returns underexposed signals back to the original, and this vibration And Odd's different words will cause cross-modulation and become different from the original sound.
In order not to cause this oscillation, it is necessary to perform ideal servo control, or use non-feedback as a linearity (linearity) for components such as amplifier elements and capacitors.

Realization of low distortion rate by two stage configuration

You can not escape distortion as long as you use an amplifying element. It is a measure to use elements with good linearity or reduce the number of elements.
In C3EQ, it is configured with only two amplification tubes C3g of high linearity, suppressing harmonic distortion and intermodulation distortion to a minimum while returning non-return.

Outstanding noise processing technology

Rectifiers and contacts used for general power supply are sources of noise. Since these noises are sharp noise of rising, they occur over a band of 50Hz to several hundred MHz, causing intermodulation and entering the audio band to make the sound muddy. A large amount of noise is generated even at the switching power supply, and the same phenomenon occurs. Based on years of switching power supply design, CS Port suppresses / cuts unnecessary noise by its noise processing technology and achieves clear sound.

Intermodulation distortion scarier than harmonic distortion

Harmonic distortion means that, when a signal passes through the element, it generates an integer multiple signal, which can be heard comfortably to humans in a sense.
Among the distortion, it is intermodulation distortion that is scary, generating uncorrelated signals that are not in the original signal, resulting in an unpleasant sound.
For example, when a signal of 1kHz and a signal of 1.1kHz pass through a rectifier or an amplifying element, a sum signal and a difference signal of the respective signals are generated. 100Hz and 2.1kHz were not found in the original signal. Since the audio signal is a collection of many frequency components, the frequency component of noise also causes intermodulation, invades the audio signal, and loses the three-dimensional effect of the sound. Again, components with good linearity are less likely to cause cross-modulation.

Product Summary

Phono equalizer amplifier C3EQM2





MC / MM Corresponding MC transformer built-in CR type vacuum tube type phono equalizer


MC input - MC trans / MM input - C3g - CR filter- C3g - FET buffer - Output trans

Conformity cartridge impedance
  • MC‥‥‥3 - 20Ω
  • MM‥‥‥47kΩ or less
Input connect
  • MC‥‥‥XLR balanced ×1・RCA unbalanced ×1
  • MM‥‥‥RCA unbalanced×2
Output connect

XLR balanced ×1 ・ RCA unbalanced ×1

  • MC‥‥‥63dB
  • MM‥‥‥40dB
Maximum output voltage
  • MC‥‥‥5V 1kHz
  • MM‥‥‥5V 1kHz
Output / Impedance

90Ω 1kHz

Total harmonic distortion THD
  • MC‥‥‥0.1% 1kHz 0.76Vrms
  • MM‥‥‥0.1% 1kHz 0.76Vrms
Power supply

AC100 / 120 / 200 / 240V 50 / 60Hz

Battery operation time

5 Hours. Optionally 9 Hours

Charging time

4 Hours. Optionally 8 Hours

Power consumption



430W 400D 90H




Silver alumite and precious rosewood veneer


AC power cable

This is a RIAA dedicated phono equalizer amplifier. Please note that it is not suitable for other equalizer curves.
Specifications, design, price, etc. may be changed without notice.