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Aleph 3 Upgrade
Aleph 3 Upgrade
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Old 26th April 2018, 03:32 PM   #11
juanitox is offline juanitox  France
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i have just mesure the voltage across R106 and i have 5,8v on both side instead of the ( 4 to 5V ) on the schema is it too much ?
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Old 26th April 2018, 03:35 PM   #12
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ref. to which schematic ?

post it , then I'll tell you what is important to check ....... everything else is just of nominal value
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Old 26th April 2018, 08:13 PM   #13
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i have just realised that my unit has been already modified , with IRF 9510 on Q103 and IRF 9210 on Q101 /Q102 and i don't like that so i think i will buy a pair of IRF 9610 as original and go with LS J74 jfet for input ..

some works to do
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Old 27th April 2018, 07:43 AM   #14
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if you expect us to reply (sometimes) , we need to be on same page
so , you really need either to post or point to ref. schematic

so , is it this one : Medium Aleph 3 8ohm@20w.
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Old 27th April 2018, 07:46 PM   #15
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Click the image to open in full size.

sorry for the delay , i have made a mistake with the 1K trimpot yesterday and two IRF9610 finished in flame :

so now i am trying to re build it with a pair of 2SJ09BL
i also have a pair of 2SJ313 is it worth to use it as regulator ( Q103) or shoukd i buy a a IRF 9610 ?
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Old 27th April 2018, 09:58 PM   #16
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for regulator use just ant P-channel TO220 you have in drawer ...... just anything from 510 to 740

using 313 there is sacrilege
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Old 28th April 2018, 07:10 AM   #17
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thanks Zen mod , always here for dumb guy

Quote:
using 313 there is sacrilege
that's why i will use it here !
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Old 28th April 2018, 07:39 AM   #18
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and you get lousier CCS using it , comparing to IRF
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Old 28th April 2018, 09:02 AM   #19
juanitox is offline juanitox  France
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Quote:
Originally Posted by Zen Mod View Post
and you get lousier CCS using it , comparing to IRF
that call me much, i have found a pair of SFP9610 instead

what is your favorite for input in aleph JFET like 2SJ109 or Mosfet ? any model not unobtainum ?
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Old 28th April 2018, 09:16 AM   #20
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Have you thought about upgrading the Aleph 3 to an Aleph 4. It wouldn't be a simple upgrade but the gains are enormous, especially in the extra headroom that the Aleph 4 has.
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