Package Include
1. Two M9 Power Amplifier Modules
Features
1. Either 2SA1943 2SC5200 or 2SK1529 2SJ200 or MJL21193 MJL21194
2. Input: single-end, stereo
3. Output: single-end, stereo
4. Power supply: 25-35V AC
5. Class A amplifier design modified on Jeff Rowland
6. Built-in voltage regulator circuit, DC servo, and speaker protection
7. Symmetrical PCB layout design for both stereo channel
8. PCB dimension: 260mm (L) x 65mm (W) x 2 PCS, gold-plated double-layer PCB
Installation Procedure
1. Assembly the power regulator circuit (both for positive and negative voltage supply) first.
2. Apply 25-35V AC to the power input of the board to check if there are correct postive and negative DC voltages.
3. Assembly other parts of each channel, except the10.5k Ohm resistor on * mark of the PCB.
4. Notice to the direction of polar capacitors and diodes.
5. Double check the placement of the components.
6. Adjust the W2 100 Ohm resistor trimmer to set the output voltage to 0V DC.
7. Adjust the W1 10K Ohm resistor trimmer to 100mV drop across the 0.22Ohm resistor.
8. Resolder the 10.5K Ohms.
Pre-Amplifiers
