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Posts by Sathimas

Adding my newest observation:   Had the phones connected directly at turning on the amp, had no hum when the e12 let the signal pass.   Got hum, starting quiet and becoming louder after a few seconds, the hum started to "oscillate" getting loud and quiet at maybe 1  volumen-change per second - then the e12 started to switch on and off.     Any idea where the problem might be?
Well, this amp is driving me absolutely mad.   I changed the resistor-values according to ambs website to decrease the sensivity of the e12.   While doing that, I changed nothing about the internal wiring of the amp. (It was hum-free before)   Now after getting the e12 (half) to work (still a bit jumpy) the hum is back.   Changed the ground wiring to cavallis alternative wiring then with no effect - changed to normal ground scheme and the hum was gone.   For...
no offense taken.   Ground wiring on the EHHA is really confusing ...
 There is no extra ground connection, since the jack is not tied to Star ground,but to the amp out ground terminals directly. Tried this while solving my hum problems. I could try the old sheme now ...
 By "engage" I mean it switches off the outputs.  I don't quite understand your question? Amp out is not connected to star ground. Amp ground (next to Amp out) is directly connected to the jack from both boards.  Star ground is connected to the ground tap of the power inlet (called "IEC" in my last post).   yes, see the picture for the wiring, it works now.    Hope I could clarify things a bit.
Waking the thread from the dead ...   My exstata gave me a shock some days ago!   I was listening to some music (moderate levels) with my Lambda Pro when suddenly the sound started distorting on the left channel and I got some deep hum too.   Unplugged the phones of course and tested them on my srm xh where they worked properly - so the extata seems to be the problem.   I ran through the setup again today and checked all the voltages and found nothing too...
Back with new problems ...   My post some months ago was (maybe) too enthusiastic.   Since the Ehha is said to be producing voltage spikes capable of frying headphones I installed an AMB e12 which is now troubling me.   I can turn on the amp, go through the adjustment of the e12 and listen to some music then for several minutes, then the e12 engages and stays "shut".   Offset on the EHHA channels (G and OUT) is drifting a bit but never higher than 4 to 5mV,...
  Older pic with a little more light :-)   Amp inside the case is a Cavalli Audio EHHA Rev. A
Finally done after 4 years and three months...
Done ... I'll look up the dimensions
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