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Old 25th November 2012, 10:26 AM   #1311
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let it play for a while

what's voltage ditto across zener ?
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Old 25th November 2012, 10:46 AM   #1312
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let it play for a while

what's voltage ditto across zener ?
Across Zener 9.4x V
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Old 25th November 2012, 11:15 AM   #1313
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that mosfet connected to R17 is somewhat off (unmatched) , but it can't be main thing for your (un)satisfaction , against F5

check AC gain of Aleph CCS , just in case

whatever , I always preferred Aleph J to F5 , at least with my spks and my ears
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Old 25th November 2012, 11:48 AM   #1314
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Zen, as I said things which are harsh with F5 are mellower with J.
So J at the very alpha stage suits me better than 5.
But I need to do the 2nd channel and connect them to my 2.5 spks(90db with woofers going down to 7.1 ohm -- same characteristic as the 2 ways that 6 moon reviewed the J with) to come to a conclusion

In itself are my readings any cause for concern
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Old 25th November 2012, 12:12 PM   #1315
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sorry for miss-read from my side

just woke up , prior to that post

well - if you have no better matched mosfets , just leave them as is and be

that was one of the reasons why I used IRFP150 in my Babelfish J - just one pair/ch. , no matching required , lesser capacitances blahblah

no matching was main reason
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Old 25th November 2012, 12:32 PM   #1316
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Nah no more matched stuff :-(.Guess the source resistors also there as an insurance against badly matched mosfets.

The other channel will be with BC critters & some changes to the grounding scheme.
Right now RCA gnd is of the amp PCB,while IN- & out gnd is off psu gnd.

Will lift the RCA gnd off the psu gnd & see whether the buzz goes
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Old 25th November 2012, 12:53 PM   #1317
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make them all off pcb gnd

just one fat wire going from PSU gnd to pcb gnd
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Old 25th November 2012, 04:51 PM   #1318
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Thanks, I'll do the second channel.
By the way what kind of effect will the mismatch have on sound ..I check the Vgs in circuit
one has ~100mV less than others.Worth the effort changing the pair :-)?
Offset is fine though ~25mV
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Old 29th November 2012, 01:09 AM   #1319
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Is there anybody out there that knows PCB design and could design an Aleph J board for the Universal Mounting Spec?
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Old 29th November 2012, 02:26 AM   #1320
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Is there anybody out there that knows PCB design and could design an Aleph J board for the Universal Mounting Spec?
19 years of PCB design here. I'd love to help and ironically enough I was planning to build an Aleph J this winter ...

I have the Aleph J schematic if someone can educate me on "Universal Mounting Spec", I can start tomorrow.
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