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Old 10th October 2005, 10:11 AM   #11
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Join Date: Aug 2001
Location: Ingolstadt Germany
Hi,

1.try to set the bias (start with both (V1/V3) pots at 0 Ohm) . Both sides should have the same bias, youŽll have to adjust them a bit as the bias changes during warmup.

2.Then set the absolute dc-offset to zero with V2 that setŽs the bias through the diff pair. This should be done with the lid on the amp cause this is quite temperature sensitive. Adjust when warm (1-1.5 hours)

William
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Old 10th October 2005, 05:47 PM   #12
Berry is offline Berry  Netherlands
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Thanx all, it looks like the problem is fixed. The output to te speaker terminals has now 9mv dc. From the -+ output to the ground 20 mv. There were some problems:
1 unbalanced - terminal connected to the groud without a cap.
2 the two resistors 2.2k changed to 4.7k
3 start point off v1/v2/v3 0 ohm, not in the center.
4 changed the irf9610 no heatsink, but mounted together(with an insulator).
5 changed the resistor of the irf9610 (not the differential pair) to lower the bias.

After building 2 stereo aleph 5 without any problems, this mono aleph x amp is finished(i hope). Maybe i will change the aleph 5 to aleph x high voltage .
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