Aleph 5 Help

PedroPO · 12th October 2002, 07:08 PM

Need some help.

just finished my aleph 5 with Kristijan Boards.

Problems:

very low sound, heavy distortion.

no hum.

The irfp240 fets don't heat up - what is supposed to be their terminal voltage?

only the irfp9610 get a bit warm

I've got 34V on each rail, IRFP240 and ZTX450 instead of MPSA18.

didn't mount the led.

all other components are like the schematic.

Is there any test to find out the fault?

Should I try out the other channel?

thanks,

jleaman · 12th October 2002, 07:44 PM

i would like to know them answers too as i have a aleph 5 soon to be powered up..

PedroPO · 12th October 2002, 10:15 PM

never mind!

I confused R17 221k with 22k.

dam red stripe look alot orange

my baby has run now for 3 hours.

It looks ok.

the fets are at 57ºC ( hey Peter Daniel hit the spot in that!)

the sinks are at 49ºC.

looks good I guess.

When I build the other channel I'll post another pic

jleaman · 12th October 2002, 10:18 PM

so how did yuo solve the problem just let it warm up ??

Mad_K · 12th October 2002, 10:22 PM

Hi!

I am also building an aleph with Kristijans A5 boards -they are really nice!

Only I am doing it as an A30 because of my powersupply
(+/- 25V).

I've had lots of problems, but they where caused by me.

Waiting for new parts now

Try to measure all the voltages from the A5 service manual, and tell us what you get. There is a fault in the manual; there should be something like 0,66V across the source resistors.

Maybe then we get a starting point for fault finding

-careful with those probes

Mad_K · 12th October 2002, 10:25 PM

Congratulations!

May we get your voltages anyway?

jleaman · 12th October 2002, 10:27 PM

PICTURES

PICTURES

PICTURES

:O)

PedroPO · 12th October 2002, 11:11 PM

pics tomorrow when the hole amp is on.

you can see a preview in

Building an Aelph 1.2

volts tomorrow too

jleaman · 13th October 2002, 12:21 AM

you should email me some photoes pedropo

jleaman@citytel.net

im thinking about making a webpage about aleph amps..

roddyama · 13th October 2002, 02:59 AM

Good Job Pedro,

Keep us informs of the progress.

Rodd Yamas***a

12th October 2002, 07:08 PM	#1
PedroPO diyAudio Member Join Date: Jan 2002 Location: Lisbon,Portugal	Aleph 5 Help Need some help. just finished my aleph 5 with Kristijan Boards. Problems: very low sound, heavy distortion. no hum. The irfp240 fets don't heat up - what is supposed to be their terminal voltage? only the irfp9610 get a bit warm I've got 34V on each rail, IRFP240 and ZTX450 instead of MPSA18. didn't mount the led. all other components are like the schematic. Is there any test to find out the fault? Should I try out the other channel? thanks, __________________ Pedro Oliveira

12th October 2002, 10:15 PM	#3
PedroPO diyAudio Member Join Date: Jan 2002 Location: Lisbon,Portugal	never mind! I confused R17 221k with 22k. dam red stripe look alot orange my baby has run now for 3 hours. It looks ok. the fets are at 57ºC ( hey Peter Daniel hit the spot in that!) the sinks are at 49ºC. looks good I guess. When I build the other channel I'll post another pic __________________ Pedro Oliveira

12th October 2002, 10:22 PM	#5
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	Hi! I am also building an aleph with Kristijans A5 boards -they are really nice! Only I am doing it as an A30 because of my powersupply (+/- 25V). I've had lots of problems, but they where caused by me. Waiting for new parts now Try to measure all the voltages from the A5 service manual, and tell us what you get. There is a fault in the manual; there should be something like 0,66V across the source resistors. Maybe then we get a starting point for fault finding -careful with those probes __________________ Mads K

12th October 2002, 10:25 PM	#6
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	Congratulations! May we get your voltages anyway? __________________ Mads K

12th October 2002, 11:11 PM	#8
PedroPO diyAudio Member Join Date: Jan 2002 Location: Lisbon,Portugal	pics tomorrow when the hole amp is on. you can see a preview in Building an Aelph 1.2 volts tomorrow too __________________ Pedro Oliveira


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12th October 2002, 07:44 PM	#2
jleaman Banned Join Date: Apr 2002	i would like to know them answers too as i have a aleph 5 soon to be powered up..

12th October 2002, 10:18 PM	#4
jleaman Banned Join Date: Apr 2002	so how did yuo solve the problem just let it warm up ??

12th October 2002, 10:27 PM	#7
jleaman Banned Join Date: Apr 2002	PICTURES PICTURES PICTURES :O)

13th October 2002, 12:21 AM	#9
jleaman Banned Join Date: Apr 2002	you should email me some photoes pedropo jleaman@citytel.net im thinking about making a webpage about aleph amps..

13th October 2002, 02:59 AM	#10
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	Good Job Pedro, Keep us informs of the progress. Rodd Yamas***a

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