Calrec EQ problem

[Audioman]

Hi All,
I have an electronic problem wit my Calrec eq on the hi frequency section
The problem is :
when i gain the max db on the pots hi frequency with the switch shelvin not pushing and the switch Q pushed the sound seems to be autooscillation and when you push the shelvin switch the problem disappear !!
i have no idea of  where is the problem but i have change all the tantalium and all the electrolitycs and all the ic's NE5532
Please let me know if you have any idea

 

[spongebob]

i have this too...don´t know why....think its normal...

 

[gyraf]

Not normal - never had that on any of my own. Maybe try stabilizing supply lines, 100nF from supply to gnd at power pins of the related IC?

Jakob E.

 

[spongebob]

thanx...a word from the father.....i´ll try that and report

 

[spongebob]

yep....i built anotherone with mnats psu....that works better...no selfoscilation at the hi-band