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Old 15th April 2009, 07:22 PM   #611
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Quote:
Originally posted by audiodan
Im sure I read somewhere that Pass Labs was selling 2SJ109BL
We are not. Rumor has it that Linear Systems is preparing a
complement to the LSK389.

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Old 16th April 2009, 08:52 AM   #612
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how Aleph J compare to F5
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Old 16th April 2009, 09:07 AM   #613
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Quote:
Originally posted by samoloko
how Aleph J compare to F5

easy ........




to my ears - J is still better , when adequate spks are used ;
if spks needs more current ( not necessarily just watts ) , it's probably better to use F5
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Old 16th April 2009, 09:29 PM   #614
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Hi,

finally my casing arrived the day before yesterday and I hope that my AJ will be finished in the next couple of days.
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Old 20th April 2009, 09:19 AM   #615
massimo is offline massimo  Italy
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I think that some of the new features intruduced in the BA1 front end schematics colud be applied in the Aleph J too.
I'm referring to the RC filter (R210 + C205 and R211 + C206 on BA1) useful to isolated and clean the PS a bit and to drop a Volt or so to keep the input fets well within their safe voltage range and to the CCS made by a 2SK170 instead of the ZTX550 (Q2 on A-J) plus the (noisy) zener, capacitor (C4) and dropping resistor (R5).
Also R7 could be replaced by a pot as in BA1.
Can we get rid of the IN- coupling cap (C1)?
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Old 20th April 2009, 12:41 PM   #616
Vigo is offline Vigo  Sweden
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I am thinking about maby building some of this myself.
But i dont have the possibilty to make my own PCB's.

Is there anyone here that can sell me some boards or point me to a place to purcase them.
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Old 20th April 2009, 01:36 PM   #617
eboz is offline eboz  United States
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Quote:
Originally posted by Vigo
I am thinking about maby building some of this myself.
But i dont have the possibilty to make my own PCB's.

Is there anyone here that can sell me some boards or point me to a place to purcase them.
Vigo,

We are discussing the possibility of using pcb's from BrianGT of chipamp.com which were designed to be build as the Mini Aleph, Alelph 5 or Aleph 30. You can still purchase them from this order form, looks like he ships international.
http://www.chipamp.com/orders.shtml

If you are interested and want to save a few dollars, I would send my boards to you for the price of shipping (read free). I have two amp boards and two power supply boards.
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Old 23rd April 2009, 10:18 AM   #618
Vigo is offline Vigo  Sweden
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Thanks alot

I whould like that very much.
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Old 16th July 2009, 03:56 PM   #619
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This thread's been quiet for a while, even though there is a GB for boards for the "J" now.
I just finished a build using the BrianGT boards and am very pleased with the outcome. Quite a bit more detail and depth than the A5 I,ve had for a couple years now.
I'm not able to bias it up to full bias due to my heatsinks so a new chassis is in order, and I would actually like to add a couple of output devices for more current into 4 ohms. Is there a consensus on the number of devices the jfets can drive successfully with the available current? My jfet's Idss is around 10ma so I could increase the front end bias somewhat if that would help.
Any and all opinions are appreciated. Thanks in advance.

Bill
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Old 16th July 2009, 04:04 PM   #620
h_a is offline h_a  Europe
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Additional fets don't give you more power into 4R, they just share the heat. 4R power is solely limited by the bias current.

Also increasing current in the differential pair is really limited, as they run already more or less full steam. 4mA limits the number of output pairs pretty much.

If you really want to go that way, you could however start paralleling jfets (matched) and upping the tail current. Then you could add more fets - but power in 4R will still be the same.

Have fun, Hannes
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