• Can be directly connected to CD players, tuners and tape recorders.

• Don't exceed 23 + 23V supply.

• Q3 and Q4 must be mounted on heatsink.

• D1 must be in thermal contact with Q1.

• Quiescent current (best measured with an Avo-meter in series with Q3 Emitter) is not critical.

• Adjust R3 to read a current between 20 to 30 mA with no input signal.

• To facilitate current setting add R8 (optional).

• A correct grounding is very important to eliminate hum and ground loops. Connect in the same point the ground sides of J1, P1, C2, C3 &C4. Connect C6 at the output ground.

• Then connect separately the input and output grounds at the power supply ground.

Technical data:

Output power: 18 Watt RMS @ 8 Ohm (1KHz sinewave)

Sensitivity: 150mV input for 18W output

Frequency response: 30Hz to 20KHz -1dB

Total harmonic distortion @ 1KHz:  0.1W 0.02%    1W 0.01%    5W 0.01%   10W 0.03%
Total harmonic distortion @10KHz: 0.1W 0.04%    1W 0.05%    5W 0.06%   10W 0.15%

Unconditionally stable on capacitive loads