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Old 4th August 2002, 11:01 PM   #1
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Smile aleph 1.2

hi guys- i am a very new newbie to this all and it's very cool! anyway- my question is- i want to build the aleph 1.2 ( its a manly thing) heh-heh! anyway i have been reading this forum for a while and i like the info and the help everybody gives. ok on to my question- the aleph 1.2 has 12 matched output devices per channel-does anybody know where i can get that many matched devices? i'm new to the electronics biz and don't have the time(read knowledge) top macth them myself! also does anybody have pcb boards for them? - ps i have visited the pass diy site and i don't see any 1.2's there, i know a couple of people have built them-why don't they post them on his site?(wow mr. Pass is such a great guy for starting that site and allowing the diy-er to build unobtainable (read unaffordable) equipment) THANKS MR. PASS- if anyone could help me i would greatly appriciate it-thanks again greg
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Old 4th August 2002, 11:40 PM   #2
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The 1.2 requires 2 sets of 12 matched FET's per channel or 24 total. 48 for a stereo pair. You might be able to use some PC boards from this site: http://web.vip.hr/pcb-design.vip/ The hardest thing to obtain might be the huge heat sinks needed for the project. Do a search of the Pass forum to read about the required size. E-mail this guy for matched FET's dherman@ksaria.com
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Old 6th August 2002, 08:28 PM   #3
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thanks for your help! i know i'll need big heat sinks-i was going to build a 50W soz. but i saw the aleph 1.2 and thought it would be a better design! also more watts!! wow what a nightmare about matching mosfets! someone told me for every 100 i can get 10 matched? holy sh-- that means i need to buy 480 to get 48 matched! there has to be a better way!! maybe i'll start off slow-maybe an aleph 5!!
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Old 6th August 2002, 08:46 PM   #4
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Not quite right, out of 144 you can get 12 matched sets of 12. The link I gave you is to a person that does the matching and can sell you the matched sets for a reasonable price. No need to go through all the bother yourself. Also, not all 48 need to be matched. You need 4 sets of 12 matched FET's. The sets of 12 need to be matched to themselves, not to the other sets.
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Old 6th August 2002, 09:11 PM   #5
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hey thanks alot for your help!!!! i am new to this. i don't know too much about electronics-thats why i like this forum. i like all the help everybody give to everybody. thanks again and i will e-mail that link!! do you think i should start smaller? i want to build something that will last for a while. i want to build amps then maybe an aleph 1.7 pre-amp. what do you think?
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Old 6th August 2002, 09:58 PM   #6
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How much power do you need? What speakers are you driving. Other than cost, the time and effort put in to building an Aleph 3 or a 1.2 is about the same. Take your pick.
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Old 6th August 2002, 10:24 PM   #7
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What amp are you using right now? Maybe that will help us to advise you on your future amp.
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Old 7th August 2002, 07:40 AM   #8
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I suggest you try something smaller, because you've said so yourself, you're a newbie to electronics. My concern is that you going to build an amp that has a big power supply, lots of transistors, huge heatsinks and so on and so forth. All these elements will present problems (and lots of them) to the inexperienced DIY'er. I suggest you start with a more modest design, don't reach for the uiltimate goal straightaway.

I'm saying this to prevent you from frustration and disappointment, and my comments are certainly not meant to be degrading. If you still want to go ahead with an 1.2, go for it, but beware of a bumpy ride....

Xcel
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Old 7th August 2002, 11:12 PM   #9
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ok here goes! first i have martin logan sequal II- electrosat/hybrid-i really love this speaker-very reveiling- my amps are b&k m-200's mono blocks. they produce about 360W into 4 ohms! they too sound good! i want more punch and detail- if thats possible? i have heard electrostats need lots of current? also i love this hobby but i don't want to get addicted like some of you ( nothing personal-just not for me) i only want to do this once! of course i haven't been exactly correct- many(read many many many) moons ago i took electronics in high school-i was good (not great/not bad) but haven't done anything since- so i figured i probably forgot almost everything. i use to solder,so i'm not afraid to do that(might need some practice)but i probably need to start smaller!! ANY SUGGESTIONS WOULD BE WELCOME- maybe aleph 5? i also have some no name speakers-8 ohm- in a di'apollo (did i get that right?) configuration. they sound very good for very cheap!! (just a note-there from canada). anyway- xcel is probably right- i don't want to get frustrated and give up!! i don't want to get in above my head-but i think from all that i have read-the aleph's are for me!!!! please if any one can help or has anybody gone through this- i will be encourgaged.. thanks alot everybody for all your help!! greg
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Old 7th August 2002, 11:55 PM   #10
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I would suggest you built Aleph 2 monoblocks. If you'll find big enough heat sinks and transformers and don't care for electric bill go for Aleph 1.2.
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