Aleph-x problems

anders.a · 13th February 2006, 06:26 PM

Ok here are a few pictures for you geniuses. I have a big problem with firing up my Aleph-X.
I have more than 10V on T8,T9 and T12,T13. And that’s before turning up to 220V.So far I have checked for AC from the power supply. The most obvious mistake is that I have mounted something backwards or made a wiring mistake. That’s why I’m posting pictures.
Any comments?

anders.a · 13th February 2006, 06:27 PM

...

anders.a · 13th February 2006, 06:29 PM

power supply

Nelson Pass · 13th February 2006, 09:15 PM

Since I don't have a clue about the transistor numbers, perhaps
someone can point a link to the schematic in question.

anders.a · 13th February 2006, 09:23 PM

Sorry

http://www.kk-pcb.com/alephx.html
http://www.kk-pcb.com/power-x.html

Nelson Pass · 13th February 2006, 10:57 PM

Not enough drive for T8 etc, or too much current through the
CCS transistors. If there's a lot of current (voltage across
Source resistors) then it's the latter. If not, then perhaps
there is not enough current going through the input diff pairs
to bias up T8 etc.

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13th February 2006, 09:15 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Since I don't have a clue about the transistor numbers, perhaps someone can point a link to the schematic in question.

13th February 2006, 09:23 PM	#5
anders.a diyAudio Member Join Date: Dec 2004 Location: Sweden	Sorry http://www.kk-pcb.com/alephx.html http://www.kk-pcb.com/power-x.html

13th February 2006, 10:57 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	Not enough drive for T8 etc, or too much current through the CCS transistors. If there's a lot of current (voltage across Source resistors) then it's the latter. If not, then perhaps there is not enough current going through the input diff pairs to bias up T8 etc.