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My first class A attempt. Aleph 3
My first class A attempt. Aleph 3
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Old 3rd February 2019, 10:31 PM   #11
Zen Mod is offline Zen Mod  Serbia
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My first class A attempt. Aleph 3
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Old 4th February 2019, 04:41 AM   #12
sifis_samos is offline sifis_samos  Greece
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Thanks guys.. :-)
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Old 4th February 2019, 09:04 AM   #13
sifis_samos is offline sifis_samos  Greece
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Quote:
Originally Posted by gary s View Post
. Oh, and don't forget the obligatory blue indication LED.
Nah i dont like blue leds.. i prefer white! More high end!
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Old 4th February 2019, 10:44 AM   #14
sifis_samos is offline sifis_samos  Greece
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What preamp would you recomend for this amp?
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Old 4th February 2019, 10:57 AM   #15
wdecho is offline wdecho  United States
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Since you have not started I would suggest a newer build than the Aleph3. Boards are here.
Printed Circuit Boards – diyAudio Store
On these builds you will find detailed build guides as well. The F5 is among the easiest to build and is great with conventional speakers. The M2X does not require the hard to find J-fets to build but J-fets can be found here for the other builds. punkydawgs | eBay Stores
You will not regret the money spent for the Aleph 3 when finished. This is not to say that the Aleph 3 will not sound great but a build guide is worth the price of the boards you have bought.

Here you will find the power supply for most all the Pass builds. Scroll down to page 15. http://www.firstwatt.com/pdf/art_f6_baf.pdf

Just a suggestion from someone who has built over 10 of the Nelson Pass designs, the Aleph 30 being my first with Daniel boards vs the store ones.

As far as pre BA3 as a pre build, B1, LSK pre if you want to diy.

Last edited by wdecho; 4th February 2019 at 11:17 AM.
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Old 5th July 2019, 12:07 PM   #16
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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My first class A attempt. Aleph 3
Default Aleph 3 kit With Irfp 250

Hi I bought a kit Aleph 3. The Mosfet is not Irf 244 but Irfp 250. Would that be ok?
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Old 5th July 2019, 03:20 PM   #17
radule is offline radule  Serbia
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With this Fischer heat sink specified at 0.34k/w , aleph 3
will be too hot to touch.
Rule of thumb for Fischer heat sinks is to add 0.05k/w to specified value.
It means that for 100w power disipation per channel you will get around 39 degrees Celsius temperature rise compared to ambient temperature.
Its steel not danger for amplifier but uncomfortable to touch.
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Old 5th July 2019, 03:58 PM   #18
Zen Mod is offline Zen Mod  Serbia
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My first class A attempt. Aleph 3
Quote:
Originally Posted by Erlend Sæterdal View Post
Hi I bought a kit Aleph 3. The Mosfet is not Irf 244 but Irfp 250. Would that be ok?
yup
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Old 12th July 2019, 12:11 PM   #19
LongRoad is offline LongRoad  Russian Federation
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Quote:
Originally Posted by Zen Mod View Post
yup
Google Переводчик
The Toshiba 2SJ201 / 2SK1530 transistors proved to be the best. The International Rectifier IRFP240 / IRFP9240 transistors ranked second. Though they are switching, nevertheless they are not much inferior to Toshiba transistors.Hitachi 2SJ162 / 2SK1058 transistors are markedly non-linear and are not recommended for high-quality amplification.The optimum of the rest current for them also turns out to be somehow vague.
For IRFP240 / IRFP9240 transistors, the optimum rest current is 300 mA.For 2SJ201 / 2SK1530 transistors, the optimal rest current is 200 ... 250 mA.For 2SJ162 / 2SK1058 transistors, the optimal rest current is 120 ... 150 mA.
http://www.electroclub.info/article/..._cmos_bias.htm
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Old 12th July 2019, 12:21 PM   #20
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My first class A attempt. Aleph 3
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