Calrec EQ problem

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

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

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.

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

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