Verify low voltage psu : Make sure that the filters are filtering and that you have all the pertinent voltges : +/-15V, +/-20V
Verify high voltage psu : Make sure +/-75V is available to both channels; Make sure ripple is minimum.
Verify that C4 (8uf 250V) is within tolerance; It may be resistive!
Also, the fact that the 387 ohms is shorted out, you may have shorted driver or output devices.
You should have 5,6 ohms (+6 ohms in NPN) at BE junction on the output devices.
joustMember Since 02 Dec 2004
Offline Last Active Apr 16 2015 09:24 AM
- Group Members
- Active Posts 605
- Profile Views 11,901
- Member Title Power User
- Age Age Unknown
- Birthday Birthday Unknown