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Old 1st April 2013, 07:11 PM   #31
generg is offline generg  Germany
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sorry....had hum in the brain....
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Old 1st April 2013, 07:50 PM   #32
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Old 29th August 2013, 08:45 AM   #33
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Hello

After solving hum problem at my aleph J i going to plan my next project
a Aleph 60.

Because of limited space in the chassis i dont get the trafos in the front of the chassis side by side

Now i have 2 options:
1. to staple the trafos in the front of the amp
with stapled psu in the rear part
2. trafos side by side from front to rear with psu on top

-in both cases the input is on top in the rear part of the amp
-the picture should be a view from the side

I dont want pick up hum from the trafos in the input stage,
which one would be the better solution?


thanks for suggestion
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Old 30th August 2013, 03:52 AM   #34
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I would pick option 1 with two trafos stack on a top. However, I've seen many people do PSU right above the transformer.
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Old 30th August 2013, 08:49 PM   #35
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Thanks, i also think first variant will be the preverred.

I`ve seen var. 2 at a f5 turbo somewhere, it seems working also.
But i really dont trust that the trannys will not stray into input stage.

I`ve heard that in the middleaxis of a tranny the magnetic field will be strongest.
And this will be in var.2 with the PSU between direct under the input stage.
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Old 30th August 2013, 09:14 PM   #36
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About dance packing inside enclosures: look at first cubical alephs :-)
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Old 31st August 2013, 10:07 PM   #37
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Quote:
Originally Posted by PKI View Post
Just installed IRF9610 in the FE of my Aleph's. I have to admit, for my taste these transistors suit the amp's sound much better!

Thanks, h_a! ;-)
The IRF9610 came from Vishay IR or someone else?
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Old 31st August 2013, 10:39 PM   #38
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Originally Posted by Zen Mod Click the image to open in full size.
Click the image to open in full size.

did you chew on conversion to cascoded Jfet FE ?




I did...
...and i found this Jfet input for Aleph 60?

but i also think about to use a cascode like in the f5 turbo v3 (Q7,Q8)
and use the standart Aleph J frontend with double the 2sj74 (4matched jfet)

could this work?

Variant from Zen looks also good but i dont understand what he did
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Old 31st August 2013, 11:11 PM   #39
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is there a question ?

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Old 31st August 2013, 11:13 PM   #40
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I don't think the links work properly...
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