Have you ever built this balanced amplifier

[aht]

75 watts RMS : 8 OHM

I built it about 1 years ago. It's my buchelor project in concept "Balanced amplifier without IC" you can down load pcb & schematic & simulation files at

http://www.aht.8m.net/AHT%20FPB150/FPB150.htm

or mail to me at ahtweb@hotmail.com

Regard

AHT

[djk]

While you have played games at DC and got a match, the inverting AC input impedance is still determined by the 562 ohm feedback resistor.

[aht]

Input (+) and (-) I used difference value of coupling capacitor because after I listen to it .It so nice dinamic and clearly more than same value of coupling capacitor and 562 OHM you can change it for another transistor .

Transistor diff matched I borrow it from McIntoch and AMC for set DC output 0V without DC servo IC and driver to output I borrow from KRELL. It's very good idea ?

I have a circuit for simulate by circircuitmaker2000

Please email to me