[yjmira]

hello , 

im having lots of noise/static hiss if the output is turned up after 5 .

all other tests and measurements are good
and audio passing trough the unit is also working fine 
and sounds good..

ive read somewhere it could be due too malfuntioning of a voltage regulator?

can someone help me out ?
thanks a lot

[JPK]

There is no voltage regulator on this unit.
Can you measure the AC voltage of the noise at the output, with input xlr unplugged and the input and output gain at max?

[yjmira]

18mv between pin 2 and 3




 

[JPK]

It could be caused by a high frequency oscillation somewhere in the circuit.
Check the value and solder joints of C3, C4, C10, C17, C26.

im having lots of noise/static hiss if the output is turned up after 5 .
Does it come gradually or suddenly after 5?

[yjmira]

it comes gradually not suddenly but now its only hearable around 8 on out.

so after reflowing those solder points and some others i checked
i now only measure 2-3mv between pin 2 and 3 on output

i guess that is in the normal range or should it be totally zero?

thanks 

[JPK]

This looks much more normal. It cannot be 0, there is always some noise.

[yjmira]

yes  all good now !

its an amazing sounding compressor 

thanks a lot for the help JPK