Another Aleph X up and running - Page 2

carpenter · 14th March 2007, 07:31 AM

Beautiful, clean job, Xavier. Clever approach.

John

Luke · 14th March 2007, 08:27 AM

nice idea with those connectors. Soon well be debating the sound of various plastic connectors

Heatsinks are really nice too, where are they from?

kiwi_abroad · 14th March 2007, 08:33 AM

Great amp,
Can you give some spec's on the heatsinks. Dimensions, thermal coefficient etc.
Thanks, Adrian

Peppe · 14th March 2007, 10:11 AM

Very nice job, Xavier! What's about pcb?

sinuko · 14th March 2007, 12:48 PM

Bravo Xavier.
with 18 V rail voltage Which is the maximum voltage swing at +- ouput connector on your aleph-x before (voltage) clipping?
Wichi value of McMillian resistor have you use?(4.7k?)
Thanks Paolo

x Beppe: about the pcb http://www.diyaudio.com/wiki/index.p...-X+Compact+PCB

Ciao Paolo

Stefanoo · 14th March 2007, 12:52 PM

i didn't know there could be all this "compaesani" on this DIY forum!

NICE!

Ciao,
Stefano.

Peppe · 14th March 2007, 01:22 PM

Quote:

Originally posted by sinuko

x Beppe: about the pcb http://www.diyaudio.com/wiki/index.p...-X+Compact+PCB

Ciao Paolo

Grazie Mille, Paolo!

Mmmmm.... the GB was 2 years old

at that time I did know nothing about Mr. Pass and this forum!

Quote:

Originally posted by Stefanoo
i didn't know there could be all this "compaesani" on this DIY forum!

NICE!

Ciao,
Stefano.

Yep Stefano, in Italy we like the beautiful things!

The Pass projects are a very elegant way to approach audio electronics!

How do not love them?!

Nice to meet on this forum

xavier1000 · 14th March 2007, 02:04 PM

Thank you guys! And, specially thanks to Grey and Nelson. It is a great design!

Let me try to answer some of your comments and give some more details:

The heatsinks are Fischer SK157 0,22ºC/W. Their size is 300x200x83mm.

The PCBs come from Carondimonio. Sinosuko is right, that link points the GB that I joined quite late.

Regarding the psu, I am using one transformer Amplimo 2x15v 625VA for each channel. CRC for filtering, using 4 100mF capacitors, i.e. a total of 400mF per channel.

I am using 8 IRFP044 per channel and the value for the source resistors is 0.27R (yes, they are Mills). The McMillan resistors are 4.75k, R1/R45 68R and I am not using caps at the input.

Regarding clipping, this measurement is still pending. However, I would say that the voltage at the fets is not as high as 18v, is more between 17.6 and 17.7v.

My initial impression on the sound is very positive. The sound is really good. Bass is tight and controlled, the midrange is sweet and extremely transparent. The highs are a little brighter than my tube amplifier but less than commercial transistor amplifiers.

Xavier

xavier1000 · 14th March 2007, 02:38 PM

Quote:

front plate isn't on par with chassis(make it thicker and especially bigger-to hide bottom plate edge).......

You are right, Zen Mod. I thought nobody would notice that...

yup · 14th March 2007, 03:11 PM

Great work! It is good to see more people complete the Aleph-x sucessfully

What type of tube amplifier are you comparing it to?

Does the absolute DC offset stay fairly steady at 350mV? or does it drift slightly?

Also, can you notice any hum at your speakers? I am going through final tweaks on my pair and have a faint hum at the speaker still, however I still plan to eliminate it completely (and post some pictures) when I get some free time. It is definatley a slow process

Jeff

14th March 2007, 07:31 AM	#11
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	Beautiful, clean job, Xavier. Clever approach. John __________________ I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com

14th March 2007, 12:52 PM	#16
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	i didn't know there could be all this "compaesani" on this DIY forum! NICE! Ciao, Stefano. __________________ Stefano

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14th March 2007, 08:27 AM	#12
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	nice idea with those connectors. Soon well be debating the sound of various plastic connectors Heatsinks are really nice too, where are they from?

14th March 2007, 08:33 AM	#13
kiwi_abroad diyAudio Member Join Date: Sep 2001 Location: Wellington, New Zealand	Great amp, Can you give some spec's on the heatsinks. Dimensions, thermal coefficient etc. Thanks, Adrian

14th March 2007, 10:11 AM	#14
Peppe diyAudio Member Join Date: Feb 2006 Location: Naples	Very nice job, Xavier! What's about pcb?

14th March 2007, 12:48 PM	#15
sinuko diyAudio Member Join Date: Aug 2004 Location: Padova	Bravo Xavier. with 18 V rail voltage Which is the maximum voltage swing at +- ouput connector on your aleph-x before (voltage) clipping? Wichi value of McMillian resistor have you use?(4.7k?) Thanks Paolo x Beppe: about the pcb http://www.diyaudio.com/wiki/index.p...-X+Compact+PCB Ciao Paolo

14th March 2007, 02:04 PM	#18
xavier1000 diyAudio Member Join Date: Feb 2005 Location: Barcelona	Thank you guys! And, specially thanks to Grey and Nelson. It is a great design! Let me try to answer some of your comments and give some more details: The heatsinks are Fischer SK157 0,22ºC/W. Their size is 300x200x83mm. The PCBs come from Carondimonio. Sinosuko is right, that link points the GB that I joined quite late. Regarding the psu, I am using one transformer Amplimo 2x15v 625VA for each channel. CRC for filtering, using 4 100mF capacitors, i.e. a total of 400mF per channel. I am using 8 IRFP044 per channel and the value for the source resistors is 0.27R (yes, they are Mills). The McMillan resistors are 4.75k, R1/R45 68R and I am not using caps at the input. Regarding clipping, this measurement is still pending. However, I would say that the voltage at the fets is not as high as 18v, is more between 17.6 and 17.7v. My initial impression on the sound is very positive. The sound is really good. Bass is tight and controlled, the midrange is sweet and extremely transparent. The highs are a little brighter than my tube amplifier but less than commercial transistor amplifiers. Xavier

14th March 2007, 03:11 PM	#20
yup diyAudio Member Join Date: Oct 2002 Location: Atlanta, GA	Great work! It is good to see more people complete the Aleph-x sucessfully What type of tube amplifier are you comparing it to? Does the absolute DC offset stay fairly steady at 350mV? or does it drift slightly? Also, can you notice any hum at your speakers? I am going through final tweaks on my pair and have a faint hum at the speaker still, however I still plan to eliminate it completely (and post some pictures) when I get some free time. It is definatley a slow process Jeff

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