Would you be so kind to show me a link, Please?
Price isn,t the question, i just would like to see it.
Price isn,t the question, i just would like to see it.
These are the boards and psu sold by chipamp.
http://www.diyaudio.com/forums/chipamp/98892-new-batch-mini-aleph-amplifier-psu-boards.html
http://www.diyaudio.com/forums/chipamp/98892-new-batch-mini-aleph-amplifier-psu-boards.html
Mini-Aleph J
I have one ca. 200W trannie and some heatsinks and some spare parts (caps and resistors) from my aleph 5 project ( they are running since almost 4 years now without problems and sound really nice) and now I'm thinking it's time to build an mini aleph j for my tweeters.
The trannie has 2*18V dc and my question is, what I have to change on the schematic, to build an aleph j with 18V and 1Amp quiescent current ?
Sorry if my question is already been answered, but in the thread I couldn't find an exact answer.
Thanks
I have one ca. 200W trannie and some heatsinks and some spare parts (caps and resistors) from my aleph 5 project ( they are running since almost 4 years now without problems and sound really nice) and now I'm thinking it's time to build an mini aleph j for my tweeters.
The trannie has 2*18V dc and my question is, what I have to change on the schematic, to build an aleph j with 18V and 1Amp quiescent current ?
Sorry if my question is already been answered, but in the thread I couldn't find an exact answer.
Thanks
Yeah! My new aleph J is singing on the bench.
What a sound!
Thanks Nelson and all the guys bringing stuff here!
This is my first single ended amplifier. I had to build one to see how SE sounds. I must say i am not disappointed.
First impression:Yes,"Liquid" is the word compared to the F5.
I will listen to it for a while prior to try the Wensan SRPP mods.
Technical question:
On both channels, I had to lower the biasing resistor R27 from 68K to 18K. Is that an issue?
As using Brian boards, i left the zenner referenced to ground instead of -V, is there any drawback?
What a sound!
Thanks Nelson and all the guys bringing stuff here!
This is my first single ended amplifier. I had to build one to see how SE sounds. I must say i am not disappointed.
First impression:Yes,"Liquid" is the word compared to the F5.
I will listen to it for a while prior to try the Wensan SRPP mods.
Technical question:
On both channels, I had to lower the biasing resistor R27 from 68K to 18K. Is that an issue?
As using Brian boards, i left the zenner referenced to ground instead of -V, is there any drawback?
Congrats!
I believe the zener ref to the -rail was said to be slightly quieter, I took mine to ground as you did.
If you check both schematics, the C5 cap position is the correct place to install R27 on Brian's boards, it makes a difference in how it biases up.
I believe the zener ref to the -rail was said to be slightly quieter, I took mine to ground as you did.
If you check both schematics, the C5 cap position is the correct place to install R27 on Brian's boards, it makes a difference in how it biases up.
Yes i installed R27 in the C5 position. I noticed the difference with aleph 30.
What value is yours? 68K?
I used a 330uF for C2 and C3 instead of 220uF.
What value is yours? 68K?
I used a 330uF for C2 and C3 instead of 220uF.
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1A is enough if your heatsinks can't handle any more. A couple watts of dissipation isn't going to make much difference heat wise, if it sounds good, it is good.
I'm curious what rail voltage and source Rs you used.
I'm curious what rail voltage and source Rs you used.
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My heatsinks are big enough, i think. (40cm x 14cmx 8cm)
Though, i wonder what is the stock Aleph J bias per device value.
I was beleiving 1A.
Is it 1.2A?
Though, i wonder what is the stock Aleph J bias per device value.
I was beleiving 1A.
Is it 1.2A?
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naah, a little more, I have built 3, but that's nitpickin anyway. 1 amp is OK but not exactly design number.
Definitely my favorite. I have three systems, and I'm working on a pair of higher bias monoblocks , doubling up the jfets and using more output fets. I have a pair of modified Seas Thors that need a little more grunt.
HP Aleph with LU1014D?
Hi,
I have a couple of PDs Aleph J boards and I was thinking about making a HP amp with them.
The power supply is +&- 15V and I was wondering if it would be easy to swap out the irfp240 for the Lu1014D. As they are both N channel devices i would imagine that the biasing is all that needs to change to deal with the lower RDS on for the LU1014D or am I showing Im our of my depth now🙂
Is this an easy mod or should I just use a couple of IRF610s?
The other thing is I was going to lower the gain. Do I risk stability if I go too low with the gain of the aleph, I think I read this somewhere?
Hi,
I have a couple of PDs Aleph J boards and I was thinking about making a HP amp with them.
The power supply is +&- 15V and I was wondering if it would be easy to swap out the irfp240 for the Lu1014D. As they are both N channel devices i would imagine that the biasing is all that needs to change to deal with the lower RDS on for the LU1014D or am I showing Im our of my depth now🙂
Is this an easy mod or should I just use a couple of IRF610s?
The other thing is I was going to lower the gain. Do I risk stability if I go too low with the gain of the aleph, I think I read this somewhere?
go back and search for J with LU in output (in this thread)
besides some additional parts for biasing , they need to be cascoded
besides some additional parts for biasing , they need to be cascoded