Aleph-X builder's thread.

[Jozef]

WTB Aleph X rev.1.0 PCB.

Hi,
I looking for this PCB from grup buy.
Regards,
Jozef

 

[JCN]

Hi,

I have read a lot the last days... whats fixed:
- 3 devices parallel
- 20V rails
- JFet input stage
- DC Servo for common mode DC

Open questions:
- IRFP044 or 240?
- How many parallel 2SJ74? Two? Three? Four?
- Is it worth to get rid of the "McMillan Resistors" at all (found a good solution with only a additional Fet).
- May it increase the bass precision with more open-loop-gain or better stay on the low figures?
- The circuit is critical regarding input impedance and DC output. But I like no DC coupling capacitors. Is a differential-DC-Servo recommended?

Thanks for your experiences

Regards,

J-C

 

[rag1]

Hey FLG,

Where does one get the Aleph J-X boards from? The DIY store or Peter Daniels?

Thanks,

Ron

 

[AudioSan]

Peter Daniels.

 

[BigE]

He has more?

 

[rag1]

Gentlemen,

How would one go about procurring the Aleph-J-X boards from Peter Daniels? (if he still has more.....?)

Thanks,

Ron

 

[Zen Mod]

why not asking him directly ?

 

[rag1]

Hey,

Thank you Zen Mod...I wasn't trying to be disrespectful....great idea!! Peter Daniels...I need your assistance on the purchase of the Aleph J-X boards! Help!! Smiling...Two sets for a stereo JX configuration...40w - 60 w. I understand these boards along with the proper rail voltage and current can get me to a sweet class a amp....

Thanks,

Ron

 

[Zen Mod]

now just copy that txt in PM to Peter

or go to his site and mail him directly



(disrespectful ? I didn't implied that you are ....... )

 

[BigE]

Hey,

Thank you Zen Mod...I wasn't trying to be disrespectful....great idea!! Peter Daniels...I need your assistance on the purchase of the Aleph J-X boards! Help!! Smiling...Two sets for a stereo JX configuration...40w - 60 w. I understand these boards along with the proper rail voltage and current can get me to a sweet class a amp....

Thanks,

Ron

Peter is Audio Sector. Last time I asked, he was out of boards.

 

[rag1]

Thanks BigE! You guys are on top of things! I 'll figure something out......

Ron

 

[still4given]

I have to say that if you can get the Gerbers, having boards made is fairly inexpensive. I just had some made for a different project and they were only about $6 each. That is what I would do. You may have to buy a few, I think the minimum was 5 pieces but you shouldn't have any trouble fining folks to buy the extras, I didn't.

Blessings, Terry

 

[rag1]

Terry,

Thanks for the support! Yea....I may end up making my own pc boards...I do have access to a full cad and circuit board system here at work.....benefits at working at large company..hee hee.....just a little more work...but , it's fun!!

Ron

 

[grimberg]

... they were only about $6 each.

Terry,

Would you mind sharing the name of the company you used?

 

[still4given]

It was this company.

Printed Circuit Board - PCBs in 24 Hours.

It took a month to get them, though to be fair, I chose the cheapest shipping. They produced them within a couple of days. I was surprised how reasonable it was. The boards are very nice. Makes you think about the logic of home etching. Here's a pic of the boards I got.

 

[ronnydepony]

I order my PCB's here : ITEAD Studio 2Layer Green PCB 10cm x 10cm Max

10 pieces for 10*10cm PCB's for only $19.90.
other sizes are possible
it takes a couple of weeks to get the PCB's but the price ???

Regards,
Ronny

 

[dieringe]

Using N-channel JFETs?

I have some 2SK389 left, would it be possible to use these dual N types for the input stage and how?

 

[Zen Mod]

flipping entire amp in polarity ; already done

considering that you can buy LSJ74 at DiyA Store , not worth fuss

it is worth only in case that you have enough mileage to complete flipping process by your self , but then you wouldn't need to ask same question

 

[dieringe]

flipping entire amp in polarity ; already done
...
it is worth only in case that you have enough mileage to complete flipping process by your self , but then you wouldn't need to ask same question

Maybe if I begin to think about it ... why is flipping the input stage not enough?

 

[Zen Mod]

leaving output stage as is will result either in silent or need for Feuerwehr



it's easier to take a look at simple Aleph (X is just left-right mirrored around input stage) - lower bank of mosfets are driven with IS , while upper bank of mosfets are load for lower , slightly driven by output signal itself

so , if you flip IS around hor. axis , you need to flip OS too in same way , to keep IS-OS modulating mechanismus