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Old 19th February 2013, 09:14 AM   #41
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Join Date: Oct 2009
Will do. I am at work now...
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Old 19th February 2013, 08:50 PM   #42
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Join Date: Oct 2009
Hi 6L6,

here are two pictures of my Zen HP amp.

The amp PCBs are mirror images of what you normally see with this amp. I haven''t realized that the files I was using were seen from the elements side. But I have changed the connections to the transistors terminals obviously.

Is it crucial in this design to star connect all the grounds? I was also planning to use shielded cables everywhere for the signal connections.

The power supply is about 20V.

Many thanks,
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Last edited by Gregje; 19th February 2013 at 09:02 PM.
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Old 24th February 2013, 11:07 AM   #43
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Join Date: Oct 2009

My bigger caps have not arrived yet. In the meanwhile I tried a regulated PS.
I used some 78xx I had lying around. I used 5k pot to set the ground voltage seen by the regulator. I lost some 2V of the output of the PSU but there is no hum whatsoever.
Still evaluating, but this might be a better solution for me that the caps.
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Old 21st May 2014, 09:28 AM   #44
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Join Date: Oct 2009
I was browsing some old posts recently.

This one need clarification on my side.
The hum I was complaining about was coming from a ground loop (I did not expect it in that place). So it was my fault. The amp is now pretty quiet using my HD595. I have somewhat more (but not much more) capacitance in the power supply.
Now it sounds more like I expected it to sound when I stared the project.
The sound has changed dramatically.

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