| Taco |
Atlast I have some pictures before the second group buy pcb's are distributed. The following pictures show a baby Aleph-X with 17Volt rails and 4,5 A bias. The transformers are from Reichelt and are 330 VA dual 15V. I used four irfp240 for each channel. With the 17Volt rails things get pretty hot, so I blew some stuff before I got this result :bawling:. But replacing the heatsinks and making these mono's things worked out fine. The C-R-C filter in the powersupply is 47.000uF - 0.28 Ohm- 47.000uF for both the plus and minus rail. But enough text, here are the pictures:
The front of one mono:
The interior:
The backside:
Also I finished my Balanced Linestage (still to be X-ed):
Thanks to Nelson, Grollins, Edwin, Netlist and others for their help. |
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| Netlist |
Nice job Taco,
I like the grills on top. ;)
Don't the 0.28 ohm resistors get too hot?
Is it two 0.28 parallel?
How silent is the output?
Any impressions of the sound?
/Hugo |
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| roddyama |
Great Job Taco.:up:
You don't need to be humble about that effort.
Tell us how it sounds. |
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| Dennis Hui |
A fine job Taco. Nice and compact.
I too like the grill top. I'm looking for something
like that for my next amp. (Haven't found the
grill material though. :( )
How does it sound, and hot does it run?
Cheers,
Dennis |
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| Dennis Hui |
Rodd,
Thanks a bunch!
Dennis |
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| promitheus |
Looks very nice.
Which boards are those?
The famous Aleph-X boards which are being ordered again?
How much power did you get with 4 Mosfets? |
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| Taco |
| quote: | Originally posted by Netlist
Nice job Taco,
I like the grills on top. ;)
Don't the 0.28 ohm resistors get too hot?
Is it two 0.28 parallel?
How silent is the output?
Any impressions of the sound?
/Hugo |
The sound is compared to my JLH + BOZ combo much more open and transparant. The imaging is just magic. The resistors are two 10 Watt 0.56 Ohm resistors parallel and it is about 40 -50 degrees Celsius. The amplifier is very very very very silent. I can't hear a thing. If I turn on the preamp I can hear the noise of the preamp (holding my ear against the tweeter). But I must confess that my speakers have a sensitivity of about 85 db/W/m. (But my room is only 25 m^2, still a student in a small country :)).
| quote: | Originally posted by Dennis Hui
A fine job Taco. Nice and compact.
I too like the grill top. I'm looking for something
like that for my next amp. (Haven't found the
grill material though. :( )
How does it sound, and hot does it run?
Cheers,
Dennis |
The whole chassis warms up to about 25 -30 degrees above ambient.
Promitheus: This are the famous Aleph-X boards, output power is about 40 Watt according to calculations, 17Volt + bias of 4,5 A. (see for excel-sheet elsewhere) |
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| hifiZen |
:bigeyes: Ooooh, CRC filter, and a clean, tight chassis layout. Looks like some really nice metalwork, too.
Nicely done indeed, Taco! :up: |
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| CheffDeGaar |
Oops, almost missed this one :ashamed: !
Very nice job, Taco !
I know the amp is dead silent, but weren't you afraid by locating the IEC inlet so close to the inputs ?. It's something I search to avoid, but surely the balanced connection helps a lot ;)
| quote: | Originally posted by Taco
The sound is compared to my JLH + BOZ combo much more open and transparant. The imaging is just magic. |
Yes ! Yes ! Exactly what I feel, and it's becoming more and more obvious as the amps (or my ears and brain ???) break in :)
Congrats again. |
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| Taco |
| quote: | Originally posted by CheffDeGaar
Oops, almost missed this one :ashamed: !
Very nice job, Taco !
I know the amp is dead silent, but weren't you afraid by locating the IEC inlet so close to the inputs ?. It's something I search to avoid, but surely the balanced connection helps a lot ;)
Yes ! Yes ! Exactly what I feel, and it's becoming more and more obvious as the amps (or my ears and brain ???) break in :)
Congrats again. |
Yes the IEC inlet was also my concern, but there was no other place for the pcb (so I put the pcb at the backplate) and I also wanted the inlet on the backside of the amplifier. But everything turned out fine, with both unbalanced/ balanced input connections. The distance between the AC wires and the input is large enough.
Your implementation is (my amp)^2. |
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| CheffDeGaar |
| quote: | Originally posted by Taco
Yes the IEC inlet was also my concern, but there was no other place for the pcb (so I put the pcb at the backplate) and I also wanted the inlet on the backside of the amplifier. But everything turned out fine, with both unbalanced/ balanced input connections. The distance between the AC wires and the input is large enough.
Your implementation is (my amp)^2. |
Well, was just asking since I had problems of hum related to mains-to-input closeness with my first amps... But they were not AXs ;)
And as we say in my country (almost litteral translation) : "don't mind the bottle, provided you get drunk" :D
Enjoy the music. |
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| grataku |
| quote: | Originally posted by CheffDeGaar
Oops, almost missed this one :ashamed: !
Very nice job, Taco !
I know the amp is dead silent, but weren't you afraid by locating the IEC inlet so close to the inputs ?. It's something I search to avoid, but surely the balanced connection helps a lot ;)
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GO TAC-OO!!!!
I dislike the location of the AC too. On the other hand with this type of vertical chassis where are you gonna put it? IME the trafo is much more noisy than the AC cord anyway and taco has that well covered. |
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| Alain Dupont |
Taco,
Well done.
Congratulations ! :wave: :wave:
Alain. |
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