Conventional phono amplifier gain, MM is mostly 100 times (40dB), MC is mostly 1000 times (60dB), but the output signal of MC cartridge is weak, so many users hope to have a higher gain model. For this purpose, this machine has made some attempts on the circuit.
The final index is 200 times (46dB) for MM and 2000 times (66dB) for MC, while still maintaining a high signal-to-noise ratio.
The overall circuit design is done independently by myself, there is no "advanced classic" circuit that does not like high imitation.
The multi-stage circuits all use Class A single-ended amplification and attenuated RIAA equalization circuits, which are characterized by their natural tone.
When selecting bile duct types, I tend to choose bile ducts with appropriate data and that can meet the design requirements, rather than blindly looking at the antique-grade "famous tubes" of imported brands, because the bile duct grades are only part of the performance of a tube amplifier. Factors, the rest of the key parts include how to design the circuit framework, how to design a reasonable circuit board, and how to adjust the appropriate parameters like "slow work and meticulous work". These are all dependent on the "handsmanship" accumulated by experience. The core part of tube amplifier production.
At present, the bile ducts equipped with this machine have three tube types: 6C33B-Q microtube, 6N4 (12AX7) and 6C12.
In order to get a lower noise floor of the machine, some enhancements have been made to the power supply circuit. There are linear power supply and switching power supply, and electronic and RC filter circuits are added. A voltage stabilizer circuit is added for anode power supply to prevent performance degradation caused by mains fluctuations. .
In terms of sound effects, it contains a high degree of reduction, which can express all the information in the vinyl record, but if you want to get low-end sound effects such as "bass bass and treble bright" from the singing and replay, do not shoot, because the high-fidelity equipment In other words, the desired sound effect should be found in the film source rather than obtained from the equipment.
Also due to the high gain of this player, buyers should ensure that the phono they use has a very low noise floor. It is not recommended to connect a phono with a built-in phono amplifier, USB interface or digital display with digital processing circuits.
Some indicators:
Gain (1KHz): MM 46dB, MC 66dB.
Distortion (1KHz, 1V output): MM: 1%, MC: 1.5%
Signal-to-noise ratio (without weighting): MM: 88dB, MC: 82dB
Input impedance: MM: 47KΩ, MC: 1KΩ
Dimensions: width 430 depth 330 height 100 (mm)
Net weight: 5.5kg
