My little Nelson Pass Aleph J rackmount

myfirstamplifier · 14th January 2013, 08:21 PM

I really like Nelson Pass designs and I just finished a "mini" version of his aleph J.. I see so many people building to print but I set out on another way to build the Aleph J amp. I'd like for anyone to submit improvements and I posted a show and tell here:

https://www.youtube.com/watch?v=zOrmEaV5xvg

This is sort of an opportunity for me other Aleph J builders or just people who appreicate the tonality of this amp!

25 watts per channel is definately enough to fill my room for both audio and video sound with this amp. You can bring it to 10 and it will not fall apart. No adverse distortion detected audibly at full tilt. Lol what a great deisgn. Thanks Nelson!

Zen Mod · 14th January 2013, 08:42 PM

ask Mods to move your thread in Pass subforum

what's temp on heatsinks , when lid is closed ?

myfirstamplifier · 14th January 2013, 10:00 PM

Quote:

Originally Posted by Zen Mod

ask Mods to move your thread in Pass subforum

what's temp on heatsinks , when lid is closed ?

Right now after running it for 2 hours @ 23 degree C indooir temp the backplane temp is reading 89 degree C.

If i use a higher cfm fan in the chassis I can get it down to 60 with the lid on... tho i haven't put the lid on yet... I will try that tomorrow.

Thanks.

Eager Beaver. My first amp.

myfirstamplifier · 14th January 2013, 10:02 PM

Just testing -- but i don't think i can even get a word to you wityhout it being moderated.. sorry -- I AM A NEWB.

AudioSan · 14th January 2013, 10:15 PM

it takes some time to get the posts out when you are new. this will change soon.
89C is way too high. the ideel temp is about 55C

myfirstamplifier · 14th January 2013, 10:29 PM

Quote:

Originally Posted by AudioSan

it takes some time to get the posts out when you are new. this will change soon.
89C is way too high. the ideel temp is about 55C

Nelson has mentioned to me in email that even 100 degrees C is fine to operate at. I couldn't really get a stright answer out of him about how high the mosfets can operate in terms of temperature.

If you see my Aleph J build here:
https://www.youtube.com/watch?v=zOrmEaV5xvg

It tends to run at a high ambient temperature... but i have asked NP several times if 100 degrees is too much for these FETS. I am uncertain and maybe he is too about the longevity running them at these temperatures. It seems my amp runs very well for hours and days at 80 degrees C heatsink temp. I can bring this temperature down but in the video is what you see is what you get.

-Jeff

myfirstamplifier · 10:33 PM

The sound quality does not seem to change much from warmup (20 Degrees C) to max temp (85 Degrees C)... I am surprised to see this. There is no audiable difference to me.

AudioSan · 14th January 2013, 10:32 PM

ooh. i was thinking of the heatsink temp

80C on heatsink is way over what i would be comfortable with

Zen Mod · 15th January 2013, 12:10 AM

next time try to stay away from NP's personal email

try first with forum

he's feeding too much mouths around

AudioSan · 15th January 2013, 01:46 AM

ZM. yes nelson have many hungry (diy) birds to feed

14th January 2013, 08:21 PM	#1
myfirstamplifier diyAudio Member Join Date: Jan 2013	My little Nelson Pass Aleph J rackmount I really like Nelson Pass designs and I just finished a "mini" version of his aleph J.. I see so many people building to print but I set out on another way to build the Aleph J amp. I'd like for anyone to submit improvements and I posted a show and tell here: https://www.youtube.com/watch?v=zOrmEaV5xvg This is sort of an opportunity for me other Aleph J builders or just people who appreicate the tonality of this amp! 25 watts per channel is definately enough to fill my room for both audio and video sound with this amp. You can bring it to 10 and it will not fall apart. No adverse distortion detected audibly at full tilt. Lol what a great deisgn. Thanks Nelson!

14th January 2013, 08:42 PM	#2
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	ask Mods to move your thread in Pass subforum what's temp on heatsinks , when lid is closed ? __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

14th January 2013, 10:15 PM	#5
AudioSan diyAudio Member Join Date: Feb 2009 Location: Trondheim	it takes some time to get the posts out when you are new. this will change soon. 89C is way too high. the ideel temp is about 55C __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers

14th January 2013, 10:31 PM	#7
myfirstamplifier diyAudio Member Join Date: Jan 2013	The sound quality does not seem to change much from warmup (20 Degrees C) to max temp (85 Degrees C)... I am surprised to see this. There is no audiable difference to me. Last edited by myfirstamplifier; 14th January 2013 at 10:33 PM.

14th January 2013, 10:32 PM	#8
AudioSan diyAudio Member Join Date: Feb 2009 Location: Trondheim	ooh. i was thinking of the heatsink temp 80C on heatsink is way over what i would be comfortable with __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers


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14th January 2013, 10:02 PM	#4
myfirstamplifier diyAudio Member Join Date: Jan 2013	Just testing -- but i don't think i can even get a word to you wityhout it being moderated.. sorry -- I AM A NEWB.

15th January 2013, 12:10 AM	#9
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	next time try to stay away from NP's personal email try first with forum he's feeding too much mouths around __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

15th January 2013, 01:46 AM	#10
AudioSan diyAudio Member Join Date: Feb 2009 Location: Trondheim	ZM. yes nelson have many hungry (diy) birds to feed __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers

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