Gemini loudspeaker

[imraneesa]

Hi,

I have Gemini loudspeaker system. it distorts when treble is increased. without treble it plays good. i have changed opamps but the problem remains.

Regards

 

[MAAC0]

Model ?

 

[imraneesa]

Model ?

RS415

 

[imraneesa]

Model ?

when i used 4000hz signal this is what i am getting on oscilloscope.

 

[MAAC0]

According to the schematic You have 12V rails. Ho do You get 31.6V Vpp on the scope ? I think You are reaching op-amp limits. Measure the rail voltages first. Verify if the voltages drop when playing loud.

 

[JMFahey]

Please post Schematic.

12V rails must be for the preamp; power amp will have much higher ones.