altitude said:Thanks for your answer John
I wired up an NE5534 on some strip board and popped it into the sockets for the one of the 2520's
The circuit works perfectly.
There is a slight difference between the Ne5534 and the 2520, but as a working solution you would be hard pressed to tell.
Will be fine until I figure a way to repair the faulty DOA. Any suggestions?
My only real issue now is to find a way to reduce the 'crosstalk' bleed from left/right to the opposite channel.
Any ideas?
Thanks
Dave
BTW.... Here are a couple of pics....
I can't tell much from the pix...
Crosstalk comes from multiple vectors.
1- electrostatic where it directly couples between paths due to intrinsic capacitance.
2- magnetic where the signal current creates a magnetic field, that gets detected by another path serving as a winding intercepting that magnetic field.
3- ground corruption where signals commingle in the grounds and show up in the audio.
#1 is mostly a HF phenomenon so look for this (things like wire dress, shielding etc) if crosstalk tinny sounding.
#2 is more of a hum source than audio corruption but could happen.
#3 if crosstalk is full range look at grounding.
Of course this is a gross oversimplification of console design, but will get you pointed in the right direction.
JR