My Aleph 5 isn't working - Page 3

DJG · 7th December 2002, 02:02 AM

Yes, all the transistors gets warm in a few minutes, except for the BC 550. I will definetly have to check that.
Where could I get datasheets of BC 550 and MPSA 18(I don't have any literature at home and it's weekend... so I need it for the pin check).

thx,
DJG

DJG · 7th December 2002, 02:08 AM

Never mind about the datasheets. I've found them on google.
I will go check it out right away...
Will report further.

Regards,
DJG

DJG · 7th December 2002, 02:59 AM

OK, I have checked the pin layout and find out that both BC 550 are inserted wrong. So I have turned them and try again...
Now the whole output part(fets and 3W resistors) is boiling. Literaly. When I turn it on it takes about 10 seconds before the heatsinks goes hot, hot, hot! What could be the reason? IRF9610 are only warm(working temperature).

regards,
DJG

MikeW · 7th December 2002, 11:05 AM

Check you voltages across the source resistors if possible. If not check to see if you have a shorted Mosfet. Check the circuit around Q5, R17,18, and 19 they set the current. Let someone else take a look at it. It will give you a break and maybe they will find something you were not looking for. Good luck, Mike

DJG · 7th December 2002, 09:04 PM

I've had it and I made another Aleph 5 by air and it works perfectly on it's first start. The sound is great, etc.

I would like to thank all of you who helped me at solving my problems.

I will send pics of my finished A5. Can't wait...

Best regards,
DJG

jleaman · 7th December 2002, 09:57 PM

We all love pic's : O )

dodonoid · 7th December 2002, 10:49 PM

Hi, DJG

I'm happy, that you resolved the problem.

I just finished a tube preamp for the alephs (60), and sounds GREAT!!! Alephs needs preamp (this is my oppinion...), and a tube one makes the sound more warm and "sophisticated". You know what I mean...

.

I will soon post a schematic and some pictures...

Regards,
Miki.

7th December 2002, 11:05 AM	#24
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	Check you voltages across the source resistors if possible. If not check to see if you have a shorted Mosfet. Check the circuit around Q5, R17,18, and 19 they set the current. Let someone else take a look at it. It will give you a break and maybe they will find something you were not looking for. Good luck, Mike __________________ MikeW

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7th December 2002, 02:02 AM	#21
DJG diyAudio Member Join Date: Aug 2002 Location: Slovenia	Yes, all the transistors gets warm in a few minutes, except for the BC 550. I will definetly have to check that. Where could I get datasheets of BC 550 and MPSA 18(I don't have any literature at home and it's weekend... so I need it for the pin check). thx, DJG

7th December 2002, 02:08 AM	#22
DJG diyAudio Member Join Date: Aug 2002 Location: Slovenia	Never mind about the datasheets. I've found them on google. I will go check it out right away... Will report further. Regards, DJG

7th December 2002, 02:59 AM	#23
DJG diyAudio Member Join Date: Aug 2002 Location: Slovenia	OK, I have checked the pin layout and find out that both BC 550 are inserted wrong. So I have turned them and try again... Now the whole output part(fets and 3W resistors) is boiling. Literaly. When I turn it on it takes about 10 seconds before the heatsinks goes hot, hot, hot! What could be the reason? IRF9610 are only warm(working temperature). regards, DJG

7th December 2002, 09:04 PM	#25
DJG diyAudio Member Join Date: Aug 2002 Location: Slovenia	I've had it and I made another Aleph 5 by air and it works perfectly on it's first start. The sound is great, etc. I would like to thank all of you who helped me at solving my problems. I will send pics of my finished A5. Can't wait... Best regards, DJG

7th December 2002, 09:57 PM	#26
jleaman Banned Join Date: Apr 2002	We all love pic's : O )

7th December 2002, 10:49 PM	#27
dodonoid diyAudio Member Join Date: Oct 2002 Location: Hungary	Hi, DJG I'm happy, that you resolved the problem. I just finished a tube preamp for the alephs (60), and sounds GREAT!!! Alephs needs preamp (this is my oppinion...), and a tube one makes the sound more warm and "sophisticated". You know what I mean... . I will soon post a schematic and some pictures... Regards, Miki.

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