2X(This product uses 6j1 tube to do pre-level lm1875 amplifier, with amp function. After 6j1 tube buffer, can significantly reduce the "digital taste" and "transistor sound", so that the whole to b a sweet natural "", the sound is more sweet, soft. Than the average lm3886, tda7294 better listen.
The pre-level is the use of 6J1 fever tube gall bladder before the class: imitation machine music fax X-10D circuit principle , to be reasonable to optimize, more stable than the original machine , the tube to play increased by 10 percent. This machine uses dual AC 18v input, do have to worry about looking for high voltage supply The board comes with boost to enjoy you in the low supply to enjoy the charm of high-voltage tube
works: a supply, tube filament began to heat, then boost from the zero voltage began to boost, and other tube filament hot, the boost is just boost finished, so this is the same with the rectification, 4 470UF The capacitor filter is very clean, excellent supply system will have the exchange of sound, the filament is DC 12V supply, the need for two tube filament is in series, the use of DC filament is also to reduce noise.
Before the output level automatically switch to promote the headset or push the rear lm1875 amplifier, that is, after inserting the headset, the amplifier without output, do insert the headset, is to promote the amplifier output
The output of the sound slightly smaller than the digital , thrust in general, if the friends can accept this way, but also the output of the product, Then you can try, after this product processing, headset sound there will be a kind of sweet and delicate "." Headphone output function can also be used to do the output level, then the other after the amplifier.
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