Aleph J-X Amp Project

[dhole]

where ? is that a joke ?

 

[ma_coule]

where ? is that a joke ?

No, this is a very serious issue!

 

[Bill Fuss]

You're mocking ME?

There are 3 different places you could power a spkr from with this amp. Either side, or bridged.

Maybe you better stick with kits.

 

[dhole]

at the output terminals ?!
in my house ?

 

[dhole]

You're mocking ME?

There are 3 different places you could power a spkr from with this amp. Either side, or bridged.

Maybe you better stick with kits.

Sorry Bill ! Didnt mean to offend you

 

[dhole]

I have a balanced input from UGS pre and output from both sides of the JX

 

[Bill Fuss]

What are your absolute offsets and your virtual offset.

In other words, how much signal swing do you have available, and how much DC are you feeding to your speaker?

 

[dhole]

0.05v between outputs
0.44v dc to ground on both outputs

 

[Bill Fuss]

That's pretty good compared to some other numbers I've heard from others. Keep an eye on them in case they start going to hell.

 

[dhole]

Cheers Bill

Thanks for your time and patience. It has been much appreciated.

Just got to build the other one now !
More heat sinking I think. This one is about 55-60 degrees .
once finished they will assist my two A5's to power my b&w 801s

dave

 

[Bill Fuss]

If it's too hot for your comfort level you can decrease R27 slightly.

 

[SCAIFF001]

YES i HAVE GOT THE IDEA OF WHAT i SHOULD HAVE

Hi SCAIFF001,
did you have any success to find the correct BOM?
Any info is very welcome

HERE IS THE BOFM i AM USEING

 

[SCAIFF001]

I found the schematic

Nope, Bill already told you that - you posted an AJ BOM and you are building an AJ-X, right? With a schematic you can update the BOM to include the missing parts.

Remember the -X is symmetrical. You wouldn't be too far off doubling that BOM per channel (assuming it is right, which I can't verify without a schematic) That would give you a few extra parts, but you'd have everything.

Be sure to order extra output devices for matching - at least 50% extra. So if using 12 output devices per channel, get at least 36 devices. Better yet get 50 since they come in tubes of 25 and you have a better chance of getting devices from the same lot in a full tube.

I have found the capacitors and resistors that I will be useing and have almost completed the order form from Newark and Mouser based on life span of 240,000hrs life span and not 1,000hrs.

I would like to use the JFETs for my CCS, how do I change the value of the resistors, or do I have to do it ? What is RP & P1 for using the JFET CCS ?

Thanks for your help.

 

[ma_coule]

HERE IS THE BOFM i AM USEING

OK, it's Aleph J BOM that I already have.
I know that BOM for "J part" of amp is the same, but mint was "X part" too.
Anyway, thanks for your effort, not only with answer to my question...
BTW, have Peter's boards but didn't start yet.

 

[SCAIFF001]

I dont have a scanner so I can not show you the schematic now, it is the one that came with the psb(s). I have theRG & RS but no RP or P1 used with a JFET J74 ?
The J74 replaces the Q2, dose it not, is it correct ?
Thanks For Your Help.

 

[ma_coule]

I dont have a scanner so I can not show you the schematic now, it is the one that came with the psb(s). I have theRG & RS but no RP or P1 used with a JFET J74 ?
The J74 replaces the Q2, dose it not, is it correct ?
Thanks For Your Help.

Those shematics I have too. Never mind.

Hard to answer your question since I'm not an expert, from the other side I'm going with 2SJ109 not with two J74. But I remember that your question was dicussed earlier. Please, try in thread.

 

[Melon Head]

2 x 2sj74 = 1 x 2sj109
Have a look at the pinout of both

 

[EUVL]

How to convert matched 2SJ74s to 2SJ109s

http://www.diyaudio.com/forums/solid-state/135154-next-best-thing-2sk389-2sj109.html



Patrick

 

[ma_coule]

Those shematics I have too. Never mind.
Please, try in thread.

Hi SCAIFF,
see post 85!

 

[Russellc]

Are there any boards out there for this project?

What sort of power and gain does the Aleph X have?

Thanks for any help here,

Russellc