jamesw
Posts: 3042
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Clone 47 Labs single ended amplifier
« on: December 1st, 2018, 8:57am »
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Selling this superb sounding unique single ended amplifier using Sony SK 3975 chipset which is the same chip used in the 47 labs gain clone amplifier. The sound is voice towards the sound of the 47 labs. Rated 60 watts per channel. This rather unique amplifier have a choice of user insert capacitors ( many sets included ) to voice the final sound to your taste and liking. Dont miss this special amp. Selling $400 only. Have too many audio toys at the moment hence selling.
Amplifier parameters:
Input voltage: AC 200-240 volts.
Output Power: A total of 120W, per channel 60W.
Quiet power: hourly 2W. Small quiescent current, low heat, can be used as a desktop amplifier.
Machine Size: Width: 172mm height: 76mm length: 300mm
Weight: 5 kg
Production technology:
1, the circuit exclusive use of the best sound quality scaffolding formula:
play danji Shao know, tube amp to sound good must use scaffolding circuit.
Because scaffolding ride well, far more than the use of sound amplifier circuit board structure.
Is in the form of a printed circuit board, not possible to use thick copper foil, copper foil leads not so much current flowing through . The final stage of the current amplifier often large, the use of a printed circuit and not appropriate, but the current of the transistor amplifier, do not use a printed circuit, but rare.
Because the circuit has been previously printed wiring board is good, you can insert elements into the furnace automatic welding, mass production. Artificial few big profits.
The scaffolding although the sound quality is good, but to each component pin interlocking the clincher, a good layout and then hand-welding, it costs time and effort, high production costs. Welding technology requires producers of high and low yields.
PCB board can do well with each chip 50W output without distortion, scaffolding well each chip can reach more than 60W output without distortion.
2, all weld a "power of the Emperor of Japan who oyaide Europe, Asia and Germany SS-47 4N silver solder," Bai Guangheng 350 degree temperature soldering station soldering.
Silver metallic conductivity is the highest of all. Oyaide The silver solder for Hi-End Audio developed, the proportion of silver is how much? 4.7%, which is the SS-47 model name comes from. Oyaide said general purity tin solder only 3N (99.9%), but the purity tin SS-47 used was 4N (99.993%), impurity content in the ten general tin one of the following points, you can get a more polished sound. Furthermore, in addition to solder silver content of 4.7%, while 1.7% of the copper to increase the conductivity and durability.
The melting point of silver up to 961.78 degrees Celsius, while component soldering temperature higher than 400 degrees easily damaged, so silver solder is generally no more than 4%. Scaffolding with 350 degree temperature soldering Silver solder joints and can guarantee perfect sound quality.
3, the machine part of the ring of cattle and AC rectifier bridge shield:
ring cow is the use of electromagnetic conversion principle, the domestic 220-volt AC power, low-voltage AC power transformer successfully put needed . The conversion process generates an electromagnetic wave shielding can reduce the circuit interference and enhance the sound quality.
Low-voltage AC ring cattle output by the rectifier bridge into a pulse current.
Domestic alternating positive and negative polarity changes per second, 50 times per second, 50 times per second interference wave bridge rectifier to convert the time for better sound quality should also be shielded.
Pulse direct current through the filter capacitor into a pure DC capacitor is a metal shell, which does not leak radio waves, so no need to shield the capacitor.
4, left and right channel independent rectified and filtered.
The vast majority of the market left and right channel amplifier is shared rectifier bridge and filter capacitor. While the components and cost savings, but the left and right channels of different audio content, if one larger channel audio fluctuations cause voltage fluctuations . Shared fluctuate to another channel, have a "mix" of.
Independent rectified and filtered, will not have a "mix" of.
The pursuit of high-fidelity HIFI amplifier should be independently rectified and filtered. Otherwise fairly "HIFI" it?
5, try to shorten the distance between components, audio input and output, the positive and negative power supply filter capacitor, the feedback resistors and capacitors directly soldered SK3875 chip pin.
Chip is the easiest welding bad element, in 350-degree heat soldered directly to the pins high degree of difficulty, requiring extremely high welding technology .
Amplifier audio signal time between changes, the element distance should be as short as possible, especially in the feedback loop. The longer the distance, the loss really is. And not to the board is scheduled to be nice to do a line and turn.
Scrape before welding component lead oxide layer to ensure minimal resistance. Between the pin bent hook with pliers after mutual buckle folder in prison and then welded well.
6, nearly 20 ground a little ground, in which the capacitor 8, each independent, and then do not steal workers. The real point is grounded, no current sound, zero noise floor. Just I weld it costs time and energy.
Amplifier power indicator LED lights with independent circuit, is not within the power amplifier circuit.
After practice test, the power indicator LED lights if put amplifier circuit, bass become less sound field narrows.
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