Linx power amp Ground loop? Oscillation? I'm a bit lost :-(

[Centauri]

That track should fix the signal gain problem, but the offset voltage is probably a function of the lower gain transistors. Will be ok for now, but good idea to replace them when you get a chance.

A goer now?

Cheers
Graeme

 

[steve_v]

Wicked!
Seems to be all go!
This thing actually sounds quite good considering the build quality...

Thanks again for all the help, I'm going to be getting some other stuff from sicom soon so I will swap those transistors then
Murphy's law though... by the time it's ready to test I can't make lots of noise.

Cheers.

Steve.

 

[steve_v]

All good!!!

Thanks to all who helped me out with this
So about that schematic you were going to draw Graeme...
Just kidding.
Any ideas as to the RMS power output of this thing?
The guy I bought it from quoted 125w into 8ohm, sound about right?
Power supply makes 75v-0-75v DC no load, I would test it if I had a scope... I might have to claim some course related costs for uni this year ;-)

Cheers.

Steve.

 

[Centauri]

With two pairs of Mosfets it should drive down to 4ohms no worries, and with that rail I would think it should do 200W easy.

I've got most of the schematic drawn out here - just needs some more component values and details

Cheers
Graeme