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help: Aleph x temperature sensitive
help: Aleph x temperature sensitive
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Old 10th October 2005, 10:11 AM   #11
wuffwaff is offline wuffwaff  Netherlands
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Join Date: Aug 2001
Location: Ingolstadt Germany

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

2.Then set the absolute dc-offset to zero with V2 that setīs 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)

een ooievaar is geen konijn want zijn oren zijn te klein!
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Old 10th October 2005, 05:47 PM   #12
Berry is offline Berry  Netherlands
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Join Date: Apr 2004
Location: Netherlands
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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