New Aleph 30

ppereira · 28th February 2005, 09:07 PM

After building my first Aleph (A5) I decided to try the A30. Next will be an "A20" (An Aleph 2 output stage with an Aleph 60 input stage). Between the A30 and the A5 the A30 sounds better to me. But then again the A5 was the first Aleph I built and construction quality wasn't that great... I layed out the PCB wich includes the power supply capacitors for simplicity sake. The capacitors are Panasonic T-HA 27000uf/63V bypassed by a Solen 4.7uf 630V film cap. Source and output resistors are oversized Mills MRA 12. All other resistors are surplus .1% 25ppm Metal Films. I bought the Mosfets (IRFP044's) and IRF9610's pre-matched from Matty05 another member of diyaudio I believe (Thanks Matt).
Anyway, this A30 has no measurable DC offset, no noise and sounds as good as anything I've heard (mostly SETs). Many thanks to Nelson Pass for making this design available. (It turns out that it would had have been much cheaper to have bought an Aleph 30 but where is the fun in that?)
The heatsinks could be a little bigger, the amplifier goes up to 60C after about 30 mins of being on.
The whole thing is 19.5"D x 15"W x 7.5" Tall and weighs a ton.
Some pictures:

ppereira · 28th February 2005, 09:08 PM

Inside:

ppereira · 28th February 2005, 09:10 PM

And the power supply section with dual 600VA transformers and dual bridges:

jleaman · 28th February 2005, 09:12 PM

Look's Good Must weight a ton eh ? Does it get hot ?

ppereira · 28th February 2005, 09:51 PM

Yep, pretty heavy beast. Temp goes up to 60C and stays there. Put some fans in but couldn't stand the noise so it's going to stay hot until I get some DC fans to run at lower than rated voltage. It should only result the amp's lifespan by a few years...

Nelson Pass · 28th February 2005, 09:51 PM

Probably gets scary when it's hungry...

ppereira · 28th February 2005, 09:59 PM

I tried to avoid it ever getting hungry by oversizing the transformers and adding much capacitance (216,000uf/channel) but I'm not sure it's enough....

Mattyo5 · 1st March 2005, 12:37 AM

Ok, looks great man! How did those transistors work? did they do ok? Just makin sure! I'm about to wire my own up

-Matthew K. Olson

ppereira · 1st March 2005, 01:54 AM

They worked great. I measure less than 5mv of dc at the outputs. Are you planning to continue selling matched mosfets?

Mattyo5 · 1st March 2005, 03:01 AM

I'm heading to Spring Break in the Dominican Republic, dental missions trip, when i return, i'll continue selling matched mosfets. I need to order more. Soon man, soon

glad they worked well for you. nice work

-Matthew K. Olson

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions	tiefbassuebertr	Pass Labs	13	27th April 2012 02:13 AM
Aleph (Single Ended) + Larvadin (no Memory Distortion) = Ultimate Aleph?	tiefbassuebertr	Pass Labs	17	9th January 2012 02:10 PM
Mini Aleph Board & Aleph 2 Parts List	gpsmithii	Pass Labs	3	16th January 2010 03:58 AM
First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions	tiefbassuebertr	Pass Labs	0	6th August 2009 11:11 AM
PCBs for Aleph 2, Aleph 3, Aleph 4 and Aleph 5 amplifiers	kristijan-k	Swap Meet	64	12th September 2002 07:55 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

28th February 2005, 09:12 PM	#4
jleaman Banned Join Date: Apr 2002	Look's Good Must weight a ton eh ? Does it get hot ?

28th February 2005, 09:51 PM	#5
ppereira diyAudio Member Join Date: Oct 2002 Location: NJ	Yep, pretty heavy beast. Temp goes up to 60C and stays there. Put some fans in but couldn't stand the noise so it's going to stay hot until I get some DC fans to run at lower than rated voltage. It should only result the amp's lifespan by a few years...

28th February 2005, 09:51 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	Probably gets scary when it's hungry...

28th February 2005, 09:59 PM	#7
ppereira diyAudio Member Join Date: Oct 2002 Location: NJ	I tried to avoid it ever getting hungry by oversizing the transformers and adding much capacitance (216,000uf/channel) but I'm not sure it's enough....

1st March 2005, 12:37 AM	#8
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	Ok, looks great man! How did those transistors work? did they do ok? Just makin sure! I'm about to wire my own up -Matthew K. Olson

1st March 2005, 01:54 AM	#9
ppereira diyAudio Member Join Date: Oct 2002 Location: NJ	They worked great. I measure less than 5mv of dc at the outputs. Are you planning to continue selling matched mosfets?

1st March 2005, 03:01 AM	#10
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	I'm heading to Spring Break in the Dominican Republic, dental missions trip, when i return, i'll continue selling matched mosfets. I need to order more. Soon man, soon glad they worked well for you. nice work -Matthew K. Olson

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)