Another Fender Stage Amp 100 DSP Problem Please HEEELP.!!

[Ensoniq1176]

Hi nosaj, ...the noise is there without connecting the jack... I already checked the relevant TP values they seem to be Ok...sorry for the question, did you take a look at the circuit diagram... i sent it as an attachment in my first post. the signal is clean up to the C47.The 45V PSU is very simple. I replaced the filtering caps with new ones this was my first guess... As the preamp is clean the +/- 16V PSU should not be the problem. There are some direct AC connections in the circuit after the preamplifier , my guess is that these additional AC voltages cause interference.. The electrolytic capacitors C86, C87 their center has a direct influence on the loudspeaker output.. I will isolate the +/- 45V voltages of the Poweramp PSU and then measure the ripple to rule out that it is comes from. Excuse my bad english this is the google translated one ...

[nosaj]

Look over your solder joints after you check the ripple. Bad or cold solder joints can cause noise also.
nosaj

[Ensoniq1176]

Well I somehow got rid of the hum. I desoldered all Darlingtons . I placed only 2 darlingtons instead of 6 ... had re-soldered all relevant soldering points. Then I soldered 4 NEW Darlingtons in again and the hum was back...then removed the new ones left the two and everything is quiet... .all 0.47ohm resistors are measured and they are ok .