Using original Toshiba A1943 / C5200 and 2SA1930 / 2SC5171.
The most important feature is the use of the current board advanced C1237 BTL speaker protection circuit, the effective elimination of open, shut down the DC output and impact sound protection, make your speakers more secure.
Basic parameters:
1. Power: DC + - (35V-55V) Recommended + -45V
2. Power: 300 watts (total harmonic distortion THD + N <0.1%), DC + -45V, 4 in Europe
3. CPI 90W, 4 ohm load measured under
4. Speaker Impedance: 4-8 ohms.
5. PCB Size: 59 * 236MM.
6. The first stage differential input current is adjusted 2MA: adjust VR1 (500R) adjustable resistance so that C, D two voltage 1.5-2V (ie R9 (1K) voltage across the resistor); this time the differential input current is 1.5 2MA, this value is the best sound quality
7. bassoon quiescent current of 100MA: adjusting the adjustable resistor VR2 (1K) so that points A and B voltage 22MV, quiescent current I = 22MV / 0.22R resistance that is 100MA; if the customer heat sink is large enough, it can make increase quiescent current, general 100MA-300MA sound best