That's what I'm thinking based on Bill Fuss's comments. I would think a Plitron 300VA 18-0-18 or Antek AN-4218 400VA should work great for ~24V rails for a stereo version or single monoblock.
I used an Antec 400VA for the standard one and a 600VA for the higher powered one. They are pretty underrated IMHO.
8" long pieces are plenty, one per channel @90 watts diss.
Always nice to get a little confirmation, thank you 🙂
I'm most likely going to use the Antek AN-4218, I've had good luck with their transformers and use them whenever I want a toroid.
I was also eyeing the AN-6218 just for the extra-hugeness and overkill factor 😛 It wouldn't cost that much more, but probably really wouldn't have much impact on sound quality and I would have that much higher of an inrush current to deal with.
I have the 4218 in my F5 and I'm guessing it should be fine for the J. In my case, I may lean to the Plitron because it is slightly narrower, thus fitting the slimline package style I want. I hope to be able to place the heatsinks about 5-5.5" apart and span them with the X daughter board that is 3.25" (think of an "H").
Not sure if that would be an issue if the + and - halves of the "X" are not tightly thermally coupled?
jfets
Can i use 2SK3700(F)??? I can't find any 2sj109. Will it sound the same? What are the alternatives?
Thanks
Hi Peter, thanks for the boards.
Can i use 2SK3700(F)??? I can't find any 2sj109. Will it sound the same? What are the alternatives?
Thanks
Hi Peter, thanks for the boards.
I don't know about the 2SK3700, but matched 2sj74's used in pairs is what many have done. The board layout accommodates 2 of them joined with a special heatsink that was part of a group buy some time ago.
I used .900A bias per fet. I tried cranking up the bias on the larger one (1.100A)because I have plenty of heatsinking, but in the end I did not like the sound and went back to .900.
Thanks Bill.
It is interesting that you preferred less current.
I am not sure what you mean by organic, could you describe the differences in a bit more detail.
It is interesting that you preferred less current.
I am not sure what you mean by organic, could you describe the differences in a bit more detail.
That's tough to put into words, it's purely subjective. In my system the envelope of the sound field develops more naturally with the standard J bias. My spkrs are Seas Excel so they don't need any help with generating dynamics.
I've had an Aleph 5 for a few years and loved it, but the J is definitely a cut above that in transparency. I'm pretty well hooked on Single Ended after trying the F5, I just didn't like the clinical (to my ears) sound. This is just my own opinion and you know what they say opinions are like (Everybody has one).
I didn't listen to it, just tested if board works correctly.
I'm mostly interested in X version, but didn't build it yet; will be using two pairs of output devices.
I'm mostly interested in X version, but didn't build it yet; will be using two pairs of output devices.
Peter,
What do you see as the maximum acceptable voltage for this amp design. Would 30+ volt rails be too far out of line.
Tad
What do you see as the maximum acceptable voltage for this amp design. Would 30+ volt rails be too far out of line.
Tad
The Aleph JX can be connected to a unbalanced signal, but will it produce the same output (watt) as connected to balanced signal?
very interesting project
with complete and accurate direction too
i receive all the package from u peter
thank you