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Aleph 3 Upgrade
Aleph 3 Upgrade
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Old 9th June 2018, 03:13 PM   #81
Zen Mod is offline Zen Mod  Serbia
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slightly less stable in temp. domain , slightly higher OLG , thus lower THD

naah ...... difference isn't night and day , so leave it as is
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Old 9th June 2018, 06:59 PM   #82
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thanks ZMa ( ZenMasterAleph)

and less speaker dampening too i presume so i will keep the 0,47 .
i also re-put the AC current resistor as the bass seems also more controlled with it.
very fun amp to tweak

let ' say i'm a crasy frogy is there a way to put a Sony 2SK82 in place of the mosfet ? 21V 1,2amp seems good for it ?
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Old 9th June 2018, 07:56 PM   #83
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more OLG , in same circuit , means more feedback , thus greater damping factor

speaking of tiny differences .......

2SK82 is depletion mode device , while mosfets in your amp are enhancement mode (google, ya kwayzee froggy )

so , that'll be completely reworked Frankenstein ......

leave it (now) as is , enjoy ..... and build something else and experiment with it
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Old 9th June 2018, 08:32 PM   #84
chede is offline chede  Germany
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Lowering source and output (current sensing) resistors gives you the opportunity to run higher bias curents - if your heatsinks can support it



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Claas
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Old 11th June 2018, 06:46 PM   #85
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KAboum ! put the 0.33 resistor and foget to resold the Bias resistor result 10V on the O,33 source resistor and one IR244 dies

so even if the Pass design are idiot proof there is some exception ( call it french touch )
by chance as now i run it as Mini Aleph J i have 3 Mosfet Left..

after some rework , i finished with 1.8AMP 22V on each IR244 and an Heatsink at 50° C

that's all folks
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Old 11th June 2018, 07:59 PM   #86
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same as is the case with Serbian one , there is no security against Frenchy idiot

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Old 14th August 2018, 07:32 AM   #87
juanitox is offline juanitox  France
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Default sissiest of all

Click the image to open in full size.

is it possible to replace the semisouth JFET with a Lovoltech LU1014D without any change ?

wants to try the queen of the siissie's aleph
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Old 14th August 2018, 08:51 AM   #88
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done before, at least on paper

will dig tonight picture , no time now
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Old 15th August 2018, 09:09 PM   #89
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Thanks Zm , i assume 21v is too much for the lovotech?
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Old 15th August 2018, 10:02 PM   #90
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can't find EUVL's solution in forum posts , doing some Voodoo with my main PC, so my files are no handy
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