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Old 12th February 2009, 01:16 AM   #601
hayenc is offline hayenc  United States
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Quote:
Originally posted by eboz



Did you ever come up with this change sheet? I have the BrianGT boards also and thinking I'd do the J if I could find enough info to pull it off correctly.

Thanks!

No, work and life got in the way. I will see how much I can get done this weekend.

Craig
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Old 12th February 2009, 01:20 AM   #602
eboz is offline eboz  United States
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Quote:
Originally posted by hayenc



No, work and life got in the way. I will see how much I can get done this weekend.

Craig

Alright cool! I'd very much like to see the result. Have you built the -J using the BrianGT board already?
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Old 31st March 2009, 08:42 PM   #603
JimT is offline JimT  Canada
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I have compared the Aleph J schematic to the BrianGT Mini Aleph schematic and boards. I think I have all the changes figured out but could use a second set of eyes to check this.

Here is a spreadsheet of the comparision

Thanks
Jim
Attached Files
File Type: zip alephj-briangt.xls.zip (9.4 KB, 307 views)
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Old 1st April 2009, 07:35 PM   #604
eboz is offline eboz  United States
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Quote:
Originally posted by JimT
I have compared the Aleph J schematic to the BrianGT Mini Aleph schematic and boards. I think I have all the changes figured out but could use a second set of eyes to check this.

Here is a spreadsheet of the comparision

Thanks
Jim

Jim,

I took a look and it looks good, but seems to be missing the zeners. Thanks for the work you've done on this.
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Old 1st April 2009, 11:49 PM   #605
JimT is offline JimT  Canada
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Thanks for checking. . I will add the zeners to the file and post it later. Until then, Z1 on the Aleph J schematic is 9.1V and is labeled Z5 on the BrianGT boards. The other zeners on the BrianGT boards are left open. I have to check the connections to the output board and add them as well.


Jim
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Old 13th April 2009, 10:56 PM   #606
Bengali is offline Bengali  United States
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Hi,

I am interested too in using the brian gt boards for an aleph J.

so are you using front end of the brian gt board in place of the aleph J's?

I have not compared schematic between the mini-A or the J.
is it the front end that make the difference?

thanks.
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Old 14th April 2009, 02:55 PM   #607
eboz is offline eboz  United States
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Quote:
Originally posted by Bengali
Hi,

I am interested too in using the brian gt boards for an aleph J.

so are you using front end of the brian gt board in place of the aleph J's?

I have not compared schematic between the mini-A or the J.
is it the front end that make the difference?

thanks.

I think you can use all of the boards, including the power supply boards. On the output boards I think it will be required to change the pin orientation of the mosfets. I think the number of output devices changes as well.
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Old 14th April 2009, 04:36 PM   #608
Bengali is offline Bengali  United States
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Hi Eboz,

so those who have built aleph J's. what are you using as a replacement for the 2SJ109's? I thought it's this JFET that
makes it an aleph J.

btw, I bought your preamp chassis :-) very nice to work with.

thx
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Old 14th April 2009, 05:33 PM   #609
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Bengali
Hi Eboz,

so those who have built aleph J's. what are you using as a replacement for the 2SJ109's? I thought it's this JFET that
makes it an aleph J.

btw, I bought your preamp chassis :-) very nice to work with.

thx

2SJ109BL is matched pair of 2SJ74BL , in one package ;

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Old 15th April 2009, 06:56 AM   #610
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Im sure I read somewhere that Pass Labs was selling 2SJ109BL
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