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Old 6th December 2010, 12:43 PM   #201
generg is offline generg  Germany
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congratulations.....

I made the same experience concerning BA-1 and BA-2...


and Semisouth R100 in the signalpart, not in the CCS, sounds also very nice...

I am eager to hear your comments F5 versus BA-1.....
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Old 11th December 2010, 02:34 AM   #202
Chad is offline Chad  United States
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I posted a few pics in the Picture thread. I really like this amp, very smooth sounding.

Genreg,

Would you share a drawing or a picture of how you implemented the Semisouth. I could see that mod on a future front end board.


Next up is an F-5. Probably will do this after the holiday season is over. Then on to a set of speakers.

Chad
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Old 11th December 2010, 10:19 AM   #203
generg is offline generg  Germany
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the Semisouth in the front end was a mismatch I suppose, Nelson Pass takes double SJ109 to drive the following SemiS in J2, so the Semisouth R100 replacing IRF610 is not so good.

But placing the SemiS R100 in the signalpath of the outputstage does not seem to be a mismatch, there are many other examples here in the forum with other amps.

But a little expensive for an experiment, maybe you take for a try only two pairs per channel..... but difficult to compare then, less damping, less power might give other results.
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Old 12th December 2010, 09:25 PM   #204
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Default It's alive!

There's some hum in the psu and the fuse blows sometimes because it's to small, but it works and plays! It was really like plug(&measure)&play!

Only one quick question: Voltage drop over the resistor, where the sense of the negative bias-board is applied, is a bit lower than that over the others, right? V at the sense-resistor was arround 0,62V and all others 0,68V (all measured before fine-tuning the output stage).

Pics tomorrow...
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Old 13th December 2010, 08:05 PM   #205
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So, here are some quick shots.

Amp is working with a 10A fuse I found here at the moment, but I will get some smaller ones, 2.2A or so, don't worry.

The (complete) box is getting relatively hot, don't know the exact temperature, but its above 49C (I've got to get some cheap meter for measuring, or maybe i can borrow one from chemics teacher).

If it's really to hot, although I don't think so, I will add some holes in the bottom and top and front and maybe add some small fans.

Best Regards, nightrush
Attached Images
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File Type: jpg d367-x.jpg (126.5 KB, 563 views)
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Old 13th December 2010, 08:42 PM   #206
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Very Nice
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Old 14th December 2010, 12:11 PM   #207
AndrewT is offline AndrewT  Scotland
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Very large download !
Why do you need to send 5.73MB pics?
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Old 14th December 2010, 01:00 PM   #208
Pano is offline Pano  United States
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images resized for web. Be kind, please resize before posting.
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Old 14th December 2010, 01:06 PM   #209
generg is offline generg  Germany
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Impressive nightrush!
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Old 14th December 2010, 01:10 PM   #210
AndrewT is offline AndrewT  Scotland
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post205 pic6 shows pairs of wires passing through holes in the aluminium plate.

Take care to ensure all the Flow and all the Return current pass through the same hole !

Thanks Panomaniac.
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