Carlo, check this thread...scroll down for the P-P only matched 2SJ74BLs.
http://www.diyaudio.com/forums/pass-labs/160380-pass-diyers-7.html
http://www.diyaudio.com/forums/pass-labs/160380-pass-diyers-7.html
You could try to parallel the GR's and get sufficient bias, but you also increase transconductance - probably not a problem though.
If this is your first NP project, you might what to start with something where you don't need to tweak as much, but if you are used to adjusting circuits, you should be able to make it work.
What is the idss of the parts you have?
If this is your first NP project, you might what to start with something where you don't need to tweak as much, but if you are used to adjusting circuits, you should be able to make it work.
What is the idss of the parts you have?
TanksCarlo, check this thread...scroll down for the P-P only matched 2SJ74BLs.
http://www.diyaudio.com/forums/pass-labs/160380-pass-diyers-7.html
For a first NP project do you recomend me other project?(Aleph30,F4, F5,??)...If this is your first NP project, ...
...What is the idss of the parts you have?
My speakers are not high efficiency.
Idss of my GRs are 2,5 - 6,5mA
I think the corrent in front end is about 8,5mA???
1. For a first NP project do you recomend me other project?(Aleph30,F4, F5,??)
My speakers are not high efficiency.
2. Idss of my GRs are 2,5 - 6,5mA
I think the corrent in front end is about 8,5mA???
1. I would recommend a project where you do not need to diverge from the original schematics, so the alephj is just as good as many of the other projects.
2. The idss is a bit low for most power amps - a phono stage or a preamp would better utilize your grs. For BA-1/2 it might actually work since it has an additional stage before driving the output devices.
Alternatively you could save your GR parts for a GR project and get some BLs for the amp you would like to build the most.
Idss of my GRs are 2,5 - 6,5mA
I would go with the 6.5 mA, and you should be fine.
So, if i go to Aleph J, to use my 2sj109GR, i have to reduce a litle The corrent in front end to not excess 6,5mA?I would go with the 6.5 mA, and you should be fine.
Or can i use the original Schematic?
Thanks
Thanks Sam for change our J-fets.@carlomar
I have some 74BL at home, and need GR's . Can we change our j-fets?
Regards
Sam
Now i have same 74BL
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