1, star ng in December 2015, the store is no longer using the Fala capacitor, instead of usingUl mate upgrade module,
2, March 13, 2015,The board has been opened, plans in May 2015 will shelves; 2 months of prepara on, test, and listening to music.
April 10th test case: the measured signal to noise ra o (100Db, not A weighted), full power distor on of 0.01%, are very good, look at the picture it
3, the package / product is used in the history of the most stringent standards of sound selec on / pairing element;
Resistance 0.5%, electroly c 2%, no electrode capacitor 1%, voltage regulator tube 1%, three tube 1% full match;
The instrument: digital bridge, 6 half million meter, capacitance tester, transistor tester, audio analyzer;
4, pure after the introduc on of the whole machine at the beginning of May, (including the feedback capacitor module);
5, recommend you to buy finished plate:
The board at all levels of the sta c current is larger, the resistance of all the welding, welding is more difficult;
The finished product board is welded with white light solder, and the United States solder wire. After passing through the power, the test sound, the distor on and the noise test are qualified, it will be sent out.
Again, the plate driving sta c current is up to 130mA, when we are debugging will enlarge the debug board is installed in the radiator, you must get the finished plate in the radiator and then power test, otherwise it will burn the tube.
6, on the power: the original machine using 2 300W transformers, and the use of 2 voltage, 8 European use: AC40V; 4 European use: AC35V;
7, on the radiator: printed board 115*80mm, finished plate 140*112mm; the current board is larger, each channel at least 2kG radiator.
8, the board debugging method: first input "DC" poten al adjustment to 0mV relay; then adjust the output to less than 50mV; the whole machine has only one adjustable resistance, adjustable output midpoint. Xiao Weiquan reached DC and non nega ve feedback structure, will be slightly larger than the common midpoint drift amplifier, posi ve and nega ve 100mV is a normal phenomenon, the original machine is the same, the need for periodic adjustment.
2pcs/Pair power amplifier board
Distor on and signal to noise ra o of the data is very good: