Biggest Aleph 2's yet?

Mattyo5 · 12th April 2005, 12:50 PM

Ok, here they are!

http://www.briangt.com/gallery/aleph-mattyo

Thanks Brian for hosting!

Thanks JRSUN for the boards!

Thanks for my family and wife for putting up with me during this project. $1500 (approx) and 200 hours of work over almost 2 years. Wow. When i turned them on, they worked, first shot. No flames, no magic smoke.

I do not have a pic of the back of the amplifiers yet. I'm gonna put in a switch to switch between high and low bias (and corresponding changes in ACIG). Right now they are running at 8A bias, and the sinks get probably close to 120degF. There are 16 fets per channel, 1kva avel toroids wrapped in rubber, 320kuf in the power supply per channel, z5 bypassed w/ BC 1uf polypro, cardas rhodium output banana jacks, balanced and unbalanced inputs, mills source and output resistors, handmatched output fets to 10mV and handmatched irf9610s to w/in 1mV. DC offset is below 50mV for both channels. I used my dad's milling machine for quite a bit of the work. and i got the heatsinks from ebay a long time ago, and the aluminum as well.

http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW

thats the aluminum guy

i used 1/8" aluminum for the front and back plates, and 1/4" for the bottom, and 1" x 1" x 1/4" angle all around, i even used brass screws as much as I could, $75 worth!

hmm what else, how do they sound....liquid.

just gorgeous! Thanks so much Nelson for allowing us to use this design. What a fantastic amp!

i'll try to post more pics of the back and of the grills when i get them done. Thanks again Brian for hosting!

-Matthew K. Olson

pinkmouse · 12th April 2005, 01:29 PM

Very impressive Matt. Well done.

Mattyo5 · 12th April 2005, 01:47 PM

Thanks!

The wiring was a little easier to get right with this project considering i had PLENTY of room inside the case

-Matthew K. Olson

jrsun · 12th April 2005, 02:18 PM

Matthew,
8A per channel ? Wow! considering 3A only in Alpeh-2.
Pictures please ! I'm going to build A2s too, see if I can get any close to yours !

Mattyo5 · 12th April 2005, 02:21 PM

its 4A bias per rail...i think thats 8 total per channel. Rails at 44V under load i think. Bias is VERY stable.

good luck w/ yours!

-Matthew K. Olson

jrsun · 12th April 2005, 02:31 PM

the AC current gain ?

Mattyo5 · 12th April 2005, 02:40 PM

i dunno yet hehe

i have a pot to adjust things, rightnow its stock value.... i'll let you know as soon as i figure it out

-Matthew K. Olson

sklimek · 12th April 2005, 03:39 PM

Wow, the proud Father of a set of beautiful twins! Congragulations, it must have been quite a journey!
Where did you get those PS Caps?
Thanks for posting - Stan

Mattyo5 · 12th April 2005, 03:56 PM

The caps are actually used. Got em again on ebay. I bought almost 30 of them for pretty cheap. They all hold voltage just fine though, and i powered them up real slow to reform them. No problems there!

-Matthew K. Olson

jrsun · 12th April 2005, 04:18 PM

HI Matthew,

CRC or CLC ? just wonder if any sound difference from differnt level of ripple ! Also any perceivable difference with and without z5 bypass cap ?

12th April 2005, 12:50 PM	#1
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	Biggest Aleph 2's yet? Ok, here they are! http://www.briangt.com/gallery/aleph-mattyo Thanks Brian for hosting! Thanks JRSUN for the boards! Thanks for my family and wife for putting up with me during this project. $1500 (approx) and 200 hours of work over almost 2 years. Wow. When i turned them on, they worked, first shot. No flames, no magic smoke. I do not have a pic of the back of the amplifiers yet. I'm gonna put in a switch to switch between high and low bias (and corresponding changes in ACIG). Right now they are running at 8A bias, and the sinks get probably close to 120degF. There are 16 fets per channel, 1kva avel toroids wrapped in rubber, 320kuf in the power supply per channel, z5 bypassed w/ BC 1uf polypro, cardas rhodium output banana jacks, balanced and unbalanced inputs, mills source and output resistors, handmatched output fets to 10mV and handmatched irf9610s to w/in 1mV. DC offset is below 50mV for both channels. I used my dad's milling machine for quite a bit of the work. and i got the heatsinks from ebay a long time ago, and the aluminum as well. http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW thats the aluminum guy i used 1/8" aluminum for the front and back plates, and 1/4" for the bottom, and 1" x 1" x 1/4" angle all around, i even used brass screws as much as I could, $75 worth! hmm what else, how do they sound....liquid. just gorgeous! Thanks so much Nelson for allowing us to use this design. What a fantastic amp! i'll try to post more pics of the back and of the grills when i get them done. Thanks again Brian for hosting! -Matthew K. Olson

12th April 2005, 01:29 PM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Very impressive Matt. Well done. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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12th April 2005, 01:47 PM	#3
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	Thanks! The wiring was a little easier to get right with this project considering i had PLENTY of room inside the case -Matthew K. Olson

12th April 2005, 02:18 PM	#4
jrsun diyAudio Member Join Date: Sep 2003 Location: North NJ	Matthew, 8A per channel ? Wow! considering 3A only in Alpeh-2. Pictures please ! I'm going to build A2s too, see if I can get any close to yours !

12th April 2005, 02:21 PM	#5
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	its 4A bias per rail...i think thats 8 total per channel. Rails at 44V under load i think. Bias is VERY stable. good luck w/ yours! -Matthew K. Olson

12th April 2005, 02:31 PM	#6
jrsun diyAudio Member Join Date: Sep 2003 Location: North NJ	the AC current gain ?

12th April 2005, 02:40 PM	#7
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	i dunno yet hehe i have a pot to adjust things, rightnow its stock value.... i'll let you know as soon as i figure it out -Matthew K. Olson

12th April 2005, 03:39 PM	#8
sklimek diyAudio Member Join Date: Oct 2004 Location: Arizona badlands	Wow, the proud Father of a set of beautiful twins! Congragulations, it must have been quite a journey! Where did you get those PS Caps? Thanks for posting - Stan

12th April 2005, 03:56 PM	#9
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	The caps are actually used. Got em again on ebay. I bought almost 30 of them for pretty cheap. They all hold voltage just fine though, and i powered them up real slow to reform them. No problems there! -Matthew K. Olson

12th April 2005, 04:18 PM	#10
jrsun diyAudio Member Join Date: Sep 2003 Location: North NJ	HI Matthew, CRC or CLC ? just wonder if any sound difference from differnt level of ripple ! Also any perceivable difference with and without z5 bypass cap ?

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