KBA-75 Help

[BillyF]

Hi,
I need some help from all the Gurus in the forum.
I have this Kinergetics Research KBA-75 Power Amp and there is a slight hum coming out from my speakers (both channel).
Could this be from the power supply?
And when I powered-off, a thug sound can be heared from right to left speaker.
How would I check if both channel were equally biased?
Please advise.
Thanks,
Billy

 

[jmateus]

amplifier problem

Yes, most definitly must be the power supply.
You should check it/replace the smoothing capacitors. Also
the ground scheme must be checked.
Good luck

 

[BillyF]

Hi jm,
Thanks for your advise.
The smoothing cap you mentioned, are you refering to the bypass caps in thepower supply usually connected parallel with the main filter caps?
How a bout the Thug sound after power-off?
Thanks again,
Billy