Aleph-x problem

globalweb · 25th September 2006, 10:37 PM

I have a problem with my Aleph-X.
When firing up and measuring Vgs over the right output transistors Q11 (I have two there). I do not get the same voltage. One is about 0.5 voltage lover.
So far I have checked if the matching (Vgs) on both transistors is ok. Any thoughts?

This is the schematic http://www.kk-pcb.com/alephx.html

globalweb · 27th September 2006, 09:38 PM

Here what I learned today. Stupd me. Make sure you mount the mosfet's TIGHT to the heat sink. Otherwise you will never get the same Vgs. Problem solved. This problem have followed for a few months now. Today I got Vgs 4.41 4.42 4.41 and 4.40 on the output transistors.

globalweb · 27th September 2006, 11:11 PM

Next question.
When fireing up. Should you start with Adjusting the Variable Constant Current Source and
then setting dc?

Zen Mod · 27th September 2006, 11:29 PM

Quote:

Originally posted by globalweb
Next question.
When fireing up. Should you start with Adjusting the Variable Constant Current Source and
then setting dc?

that's iterative method
two DMMs and two screwdrivers

25th September 2006, 10:37 PM	#1
globalweb diyAudio Member Join Date: Sep 2006	Aleph-x problem I have a problem with my Aleph-X. When firing up and measuring Vgs over the right output transistors Q11 (I have two there). I do not get the same voltage. One is about 0.5 voltage lover. So far I have checked if the matching (Vgs) on both transistors is ok. Any thoughts? This is the schematic http://www.kk-pcb.com/alephx.html

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27th September 2006, 09:38 PM	#2
globalweb diyAudio Member Join Date: Sep 2006	Here what I learned today. Stupd me. Make sure you mount the mosfet's TIGHT to the heat sink. Otherwise you will never get the same Vgs. Problem solved. This problem have followed for a few months now. Today I got Vgs 4.41 4.42 4.41 and 4.40 on the output transistors.

27th September 2006, 11:11 PM	#3
globalweb diyAudio Member Join Date: Sep 2006	Next question. When fireing up. Should you start with Adjusting the Variable Constant Current Source and then setting dc?

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