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Aleph 2 build questions
Aleph 2 build questions
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Old 24th June 2018, 10:18 AM   #21
Danger Mouse is offline Danger Mouse  Germany
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ok let`s try:


I had the same questions. looked in the Service Manuals & some members told me that:


Aleph 3 & 30 pretty much the same
-both mosfet frontend
-aleph 3 -unbal Input, -2 Output pairs, -2.1A bias
-aleph 30 -Bal/unbal Input, -3output pairs, -1,6A bias


Aleph J
-jfet frontend -bal/unbal Input, -2output pairs, -bias in schematics not specified but 1,6A-2A bias should be ok.


The most difference in Sound is because the use of jfets / mosfets
in the frontend.


Mosfets- darker, more dynamic, Little bit more bass than J,
Jfets -more detailed, better top end, not so good bass.


Never heard a mosfet frontend Aleph, so not my own experience.


Hopefully i could help you
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Old 24th June 2018, 10:45 AM   #22
Narside is offline Narside  Russian Federation
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thanks mates! things are goimg clear now, i will stay with aleph 3, going to simulate it and design PCB
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Old 9th July 2018, 08:13 PM   #23
Narside is offline Narside  Russian Federation
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I need your advice please about power supply for aleph 3. I intend to build it as bridge-CRC-voltage stabilizer. So i plan to output 35 V from CRC filter and than to decrease it by tl431+Mosfet in order to obtain +-25V. What are the disadvantages of this approach except power dissipation of 10 watts? Which electrolytic capacitors (model, brand) for the reasonable price will be ok in this power supply (22 000 uf) as it tends to be the most expensive part overall?
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Old 9th July 2018, 08:24 PM   #24
Zen Mod is online now Zen Mod  Serbia
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Aleph 2 build questions
how you got to power dissipation of 10W ?

skimming - using (existing?) power transformer then caps with increased voltage, then decreasing voltage is recipe for bigger expenses than using proper xformer and caps from the start

18Vac secondaries will give you something as 22V5dc at caps , loaded onditions

to shave 35V to 25V , there is difference of 10V , multiplied with Iq ( at least 3A for two channels) and that's 30W per rail , 60W for both rails

that , not disputing way how you got starting figure of 35Vdc

don't get me wrong - I certainly tried more than zillion times either to skim expenses or simply to be smartjack , but sometimes most effective and most rewarding way is to do things as smarter guys are doing it
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Last edited by Zen Mod; 9th July 2018 at 08:27 PM.
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Old 9th July 2018, 08:34 PM   #25
Narside is offline Narside  Russian Federation
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Zen Mod, your advices are more than welcommed which caps would you advise?
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Old 9th July 2018, 08:45 PM   #26
Zen Mod is online now Zen Mod  Serbia
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Aleph 2 build questions
first say that you're going to use 18 to 20Vac secondaries

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Old 9th July 2018, 08:51 PM   #27
Narside is offline Narside  Russian Federation
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Ok i promise
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Old 9th July 2018, 09:40 PM   #28
Zen Mod is online now Zen Mod  Serbia
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Aleph 2 build questions
first you need to chosse between snap-in and computer grade caps

first one are in economic range , second in expensive range

brands - usual suspects and you choose by availability ( price and level of complication)

Panasonic , Philips , F&T etc.

just go to mouser , digikey, Buerklin , TME ....... choose electrolytic caps , put 25V or 35V in filter , capacitance of your liking ( I prefer 33mF) .......say 15mF to 47mF (mF being miliFarad) then observe

according to these information you get there , you can look more locally , or buy from there

if in doubt , post here
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Old 9th July 2018, 10:26 PM   #29
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Aleph 2 build questions
for instance :

Aluminum Electrolytic Capacitors | Capacitors | DigiKey
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Old 10th July 2018, 03:38 PM   #30
Danger Mouse is offline Danger Mouse  Germany
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Quote:
Originally Posted by Narside View Post
....So i plan to output 35 V from CRC ...
If you have a trafo with enough VA (Watt) you can make a Aleph 60? It will have 35V rails
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