My DIY Aleph 5 is Alive!!

john65b · 29th July 2009, 02:07 AM

So here she is...I spent quite a bit on the chassis (thanks Cowrang), but I knew this amp would be a keeper. So far not disappointed....

Need a little more critical listening, but so far, I am happy...no hum, hiss or anything. DC Offset at 20mv and 17mv. .7v across R91 source resistors, 34.5V rails, 600VA Piltron tranny. Power Supply Filter is a 56kuf/.215 ohm/56kuf per channel. And she looks quite nice too. Still have to put in the 75C thermal cutoff and cool VU meter in the center hole...work I hope to hit this weekend...

Driving it is my Audionote M7 clone with LED Bias and other fun stuff...and a crappy Sony 400CD player as transport with a DIY Cirrus Logic CS4397 DAC that I am still modding...

And my Magnepan Tympani IVa's love it so far...

grubyhalo · 29th July 2009, 02:49 AM

Very nice.

Glad you didn't waste much money on the TV, you had your priorities straight!

john65b · 29th July 2009, 03:04 AM

I garbage picked that LCD. Not too proud to pick, I say...

A new 12VDC SMPS and it sparked right up. Even my wife was impressed, which doesn't happen very often....

Besides, I have a projector based Home Theater in the other room....this TV needs to be just big enough to follow CNBC.

fff0 · 29th July 2009, 10:09 AM

Woww.... that casing is nice(Pass look alike)..... Where you got it from?

analog_soul · 29th July 2009, 02:51 PM

Just put on the meter infront & it looks like the XA.5 series amp

john65b · 29th July 2009, 04:17 PM

The chassis came from our fellow member Cowrang. He had planned on making an Aleph 2 monoblock. I bought one and the other was sold to another member here. You can see the chassis on his Avatar

fff0 · 29th July 2009, 04:47 PM

Hi,

Thanks.
I saw it.

cowanrg · 29th July 2009, 04:49 PM

looks great! glad to see someone is using the case. there are a few of them out there...

john65b · 29th July 2009, 05:34 PM

Yes, that chassis really made the amp worth while. I sand blasted the inner panel that the output devices and heat sink bolt to in order to get the best heat transfer, and was considering sandblasting the heatsinks. I found a local shop that will Anodize the sinks after the sandblast, but decided to hold off until I see how the powerder coated sinks work out.

I ran it for a couple hours last night and had a thermocouple jammed into one of the top screw holes on the inner panel. It got no hotter than 110F on both sides. I also used Kapton insulators on the output devices for their superior heat transfer to the panel and sinks.

So far, quite happy. Now to finish the meter and thermal switch...

merlin2069er · 29th July 2009, 05:48 PM

Very nice. I'm hunting around for a chassis for my F5.

Does he have any left?

29th July 2009, 02:07 AM	#1
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	My DIY Aleph 5 is Alive!! So here she is...I spent quite a bit on the chassis (thanks Cowrang), but I knew this amp would be a keeper. So far not disappointed.... Need a little more critical listening, but so far, I am happy...no hum, hiss or anything. DC Offset at 20mv and 17mv. .7v across R91 source resistors, 34.5V rails, 600VA Piltron tranny. Power Supply Filter is a 56kuf/.215 ohm/56kuf per channel. And she looks quite nice too. Still have to put in the 75C thermal cutoff and cool VU meter in the center hole...work I hope to hit this weekend... Driving it is my Audionote M7 clone with LED Bias and other fun stuff...and a crappy Sony 400CD player as transport with a DIY Cirrus Logic CS4397 DAC that I am still modding... And my Magnepan Tympani IVa's love it so far... __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

29th July 2009, 03:04 AM	#3
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	I garbage picked that LCD. Not too proud to pick, I say... A new 12VDC SMPS and it sparked right up. Even my wife was impressed, which doesn't happen very often.... Besides, I have a projector based Home Theater in the other room....this TV needs to be just big enough to follow CNBC. __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

29th July 2009, 04:17 PM	#6
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	The chassis came from our fellow member Cowrang. He had planned on making an Aleph 2 monoblock. I bought one and the other was sold to another member here. You can see the chassis on his Avatar __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

29th July 2009, 05:34 PM	#9
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	Yes, that chassis really made the amp worth while. I sand blasted the inner panel that the output devices and heat sink bolt to in order to get the best heat transfer, and was considering sandblasting the heatsinks. I found a local shop that will Anodize the sinks after the sandblast, but decided to hold off until I see how the powerder coated sinks work out. I ran it for a couple hours last night and had a thermocouple jammed into one of the top screw holes on the inner panel. It got no hotter than 110F on both sides. I also used Kapton insulators on the output devices for their superior heat transfer to the panel and sinks. So far, quite happy. Now to finish the meter and thermal switch... __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

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29th July 2009, 02:49 AM	#2
grubyhalo diyAudio Member Join Date: Aug 2008	Very nice. Glad you didn't waste much money on the TV, you had your priorities straight!

29th July 2009, 10:09 AM	#4
fff0 diyAudio Member Join Date: Jul 2008	Woww.... that casing is nice(Pass look alike)..... Where you got it from?

29th July 2009, 02:51 PM	#5
analog_soul diyAudio Member Join Date: Jun 2009	Just put on the meter infront & it looks like the XA.5 series amp

29th July 2009, 04:47 PM	#7
fff0 diyAudio Member Join Date: Jul 2008	Hi, Thanks. I saw it.

29th July 2009, 04:49 PM	#8
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	looks great! glad to see someone is using the case. there are a few of them out there...

29th July 2009, 05:48 PM	#10
merlin2069er diyAudio Member Join Date: Sep 2008 Location: Toronto	Very nice. I'm hunting around for a chassis for my F5. Does he have any left?

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