Sebastien
Active Member
Hi Guys,
First of all any help on this is greatly appreciated.
So while i'm waiting for parts to arrive for my AU11000 i've jumped onto another project that hopefully is an easier fix.
Fault: The amp operates as normal until tone defeat is turned off. Then the amp has a quiet but erratic kind of hiss with irregular dull pops now and again.
Trouble shooting and notes that may help diagnose:
The noise isn't affected by volume and is present at 0 volume.
The noise isn't present when the power amp is separated and the amp is used as a pre amp.
DC at the speaker terminals fluctuate around 20mv on both channels.
One thing i've noted this evening while looking on board F-2599 Equalizer Circuit Board and using a CRO is that T01 (C1222 2E63A) has visible distortion that is consistent across other transistors on the board on the Collector only, but the Emitter and Base from what i can tell looks clear.
Could this indicate the culprit?
Any thoughts are greatly appreciated
First of all any help on this is greatly appreciated.
So while i'm waiting for parts to arrive for my AU11000 i've jumped onto another project that hopefully is an easier fix.
Fault: The amp operates as normal until tone defeat is turned off. Then the amp has a quiet but erratic kind of hiss with irregular dull pops now and again.
Trouble shooting and notes that may help diagnose:
The noise isn't affected by volume and is present at 0 volume.
The noise isn't present when the power amp is separated and the amp is used as a pre amp.
DC at the speaker terminals fluctuate around 20mv on both channels.
One thing i've noted this evening while looking on board F-2599 Equalizer Circuit Board and using a CRO is that T01 (C1222 2E63A) has visible distortion that is consistent across other transistors on the board on the Collector only, but the Emitter and Base from what i can tell looks clear.
Could this indicate the culprit?
Any thoughts are greatly appreciated