Vacuum tube phono equalizer reproducing clear sound of analog disk without incidental sound
Thought of C3EQ phono amp
The mission of the equalizer amplifier is to accurately convert the current generated by the MC cartridge to the voltage, accurately equalize it to the RIAA curve, and amplify it to the level required by the preamplifier without adding extra things.
The I-V conversion is a C3EQ phonoamp concept, which amplifies with a small number of stages while driving with a MC transformer with high linearity (linearity) and drives the CR network with low impedance.
Use ultra-reliable tube C3g
The voltage amplification of the high linearity is advantageous for a triode which is a constant voltage element. Also, since the distance between the electrodes and the thickness of the wire are effective for linearity, it is advantageous that the grid line is thin and the gap between the electrodes is large.
There are NF type and CR type in the phono equalizer method. Since C3EQ uses C3g and FET follower, it drives the CR equalizer circuit accurately with high linearity and low impedance. For the CR filter, a 1% accuracy foil-wound capacitor developed for communication is used to ensure stable operation.
MC transformer built-in, transformer output system
Since MC transformer is built in, you can use it only by connecting phono cables. Because the output can also be separated from other equipment by the transformer method, it is less susceptible to noise and does not add extra things.
Balanced, unbalanced input selectable
For connection to cartridges, either balanced input or unbalanced input can be selected. Output with high signal level is only imbalanced.
Non-NFB technology reproducing original sound in high fidelity
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.
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.
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.
Noise generation at the contact point
Amplifiers have many contact points. When looking at the micro level, there is a rectification effect there, and noise is emitted.
Battery-driven system ensuring quite high quietness
Disconnecting from a line driven by a battery
Various noise is misplaced on the AC line. From the outside of the audio system, switch noise of large equipment and noise due to current distortion etc. come in through the cable. Also in the audio system, the AC cable of each equipment creates a loop and generates electromagnetic noise. In an equalizer amplifier that handles a very small voltage, these noises become a major obstacle.
Operating time during battery operation
For the battery, use a large-sized nickel metal hydride battery. It is possible to operate for 5 hours with one charge, but it can be increased to 9 hours by option.
Switching power supply + analog power supply
It is not exaggeration to say that the sound of the amplifier is determined by the power supply. Transformer type power supply suffers from mechanical vibration generated by the transformer and processing of generated magnetic flux, but this unit adopts switching power supply without risk.
Suitable for the reference machine, it responds more quickly to the voltage regulated by the switching power supply. We arrange highly accurate analog power supply independently on the left and right channels, and are making it clean. From there, it produces a sound like a clear stream of the Alps.
Outstanding noise processing technology
Rectifiers and contacts used for general power supply are sources of noise. Since these are sharp noise of rising, they occur over the band of 50 Hz to several hundred MHz, entering the audio band and making the sound muddy, causing intermodulation. Of course, the switching power supply also generates noise greatly, causing the same phenomenon.
CS Port noise processing technology cultivated over many years of switching power supply design suppresses / cuts unnecessary noise and achieves clear sound.
Phono equalizer amplifier C3EQ
|Method||MC transformer built-in CR type vacuum tube type phono equalizer|
|Constitution||MC trans - C3g - CR Filter - C3g - FET buffer - Output trans
NiH Battery power supply with automatic charge function
|Conformity cartridge impedance||3-20Ω|
|Input connect||XLR balanced, RCA unbalanced selection (not be used at the same time)|
|Output connect||RCA unbalanced|
|Maximum output voltage||6V 1kHz|
|Output / Impedance||50Ω 1kHz|
|Total harmonic distortion THD||0.1% 1kHz 0.76Vrms|
|Power supply||AC100/120/200/240V 50,60Hz|
|Battery operation time||5Hour. Optionally 9Hour|
|Charging time||4Hour. Optionally 8Hour|
|Finish||Silver alumite and precious rosewood veneer|
|Accessories||AC power cable|
|Warranty period||5 years (excluding consumables) registration is required|
* MM cartridge not use