Hi,
I´d like to step back an see the amplifier just as a black box.
The black box has
* signal input
* signal output
* power supply
Can you please define:
* signal input: What is the source? What frequency range (do you need DC coupling?). Is the signal input true floating or is it related (connected somehow) to the power supply or the output outside of the black box?
* signal output: What is the load? What load impedance? related to which return signal? Is there any additional connection to/from the load to any other device outside the black box?
* power supply: Is it a true dual supply with 3 (or 4) wires with true (low ohmic) GND at the center tap? What type is it (battery, switch mode, linear...)? what´s the max current specification?
Klaus