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Aleph J illustrated build guide
Aleph J illustrated build guide
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Old 11th September 2013, 03:27 PM   #41
6L6 is online now 6L6  United States
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Aleph J illustrated build guide
wengtech - Your transformer would be ideal for a stereo F5Turbo or a Burning amp.

I suggest using it for a project more suited to it's specification and buying a transformer specifically for the AJ.
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Old 11th September 2013, 03:33 PM   #42
ticktock is offline ticktock  Scotland
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Quote:
Originally Posted by 6L6 View Post
You could mount it soldier-style and have only the thin lead on that side, or
Soldier style? Please help a non-native english speaker.


Quote:
Originally Posted by wengtech View Post
hi 6L6,
i have toroidal with 25-0-25 / 20A
can i use with aleph J ? (previously it is okay with my aleph 30)
i am afraid it will run too hot for the J

thanks.
At least I would make the PSU CRCRC style to lower the DC voltage near 26 - 27 V.
FWIW 25 V AC = 35 V DC is way too much. Agree with 6L6 though, best to use
it for a more suitable project.
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Old 11th September 2013, 03:45 PM   #43
BobEllis is offline BobEllis  United States
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wengtech,

Whether you can use that transformer depends on your confidence in exceeding the 2SJ74's ratings. The rail voltage will be similar to what you had in your A30, 30+V. Assuming that your heat sinks are up to the output section heat (the same as similarly biased A30), you can probably get away with running the jfets, see NP's F5Turbo article, where he says that the 2SJ74s fail at 43V. You might consider doubling them up to reduce individual dissipation, use 2 on each side of the differential. Better yet, use the transformer for a cascoded F5TV3 as already suggested
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Old 11th September 2013, 03:50 PM   #44
BobEllis is offline BobEllis  United States
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Soldier style: Standing at attention, with the body vertical. Took this native English speaker and Navy veteran a second to figure that one out so don't feel bad ticktock.
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Old 11th September 2013, 04:02 PM   #45
wengtech is offline wengtech
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ouch... too bad.
maybe it should be retired until i get the properly amp for it.
thanks for advice guys....

btw what about pre amp for the J ?
my opinion the aleph p1.7 and the pumpkins will be suitable for the J.

any suggest?
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Old 11th September 2013, 04:21 PM   #46
henryve is offline henryve  South Africa
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Quote:
Originally Posted by wengtech View Post
ouch... too bad.
maybe it should be retired until i get the properly amp for it.
thanks for advice guys....

btw what about pre amp for the J ?
my opinion the aleph p1.7 and the pumpkins will be suitable for the J.

any suggest?
Depends on your source(s). If it's only going to be digital then I would suppose a B1, DCB1, Lightspeed Attenuator would also work.

As for myself, I will have a choice between DCB1 (Hypnotize) and Aikido + Tetra. In the meantime my 22 year old Rotel RC980BX is doing that job.
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Old 11th September 2013, 04:45 PM   #47
6L6 is online now 6L6  United States
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Aleph J illustrated build guide
Click the image to open in full size.
The bigger resistors are mounted soldier-style.

(I thought soldier style was the real term for that... maybe not...)
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Old 11th September 2013, 05:28 PM   #48
wengtech is offline wengtech
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Quote:
Originally Posted by henryve View Post
Depends on your source(s). If it's only going to be digital then I would suppose a B1, DCB1, Lightspeed Attenuator would also work.

As for myself, I will have a choice between DCB1 (Hypnotize) and Aikido + Tetra. In the meantime my 22 year old Rotel RC980BX is doing that job.
thanks for advice
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Old 11th September 2013, 05:31 PM   #49
wengtech is offline wengtech
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one more question for today

6L6:
The basic topology is this. 18+18V transformer, of at least 300VA, CRC filter with 8 15,000uF 25V capacitors and 8 (4 per rail) 0.47ohm 3W resistors.

is that for 2ch stereo or 1ch mono?
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Old 11th September 2013, 06:16 PM   #50
Bones13 is offline Bones13  United States
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Aleph J illustrated build guide
Stereo if you hook the pos and neg rail to both boards.
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