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Old 10th October 2012, 11:45 PM   #61
toufu is offline toufu  United States
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Originally Posted by AudioSan View Post
aleph2 is not aleph60. aleph2 is a 100W classA amp.
Thanks... Is Aleph 2 just an Aleph 60 with higher bias and rails?
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Old 10th October 2012, 11:47 PM   #62
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yes. more or less
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Old 11th October 2012, 12:08 AM   #63
PKI is offline PKI  United States
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I am trying to map an original schematic onto the boards.
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Old 11th October 2012, 12:10 AM   #64
toufu is offline toufu  United States
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I am trying to map an original schematic onto the boards.
You don't have to do the mapping yourself. Just download the spreadsheet on chipamp.com and populate according to it.
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Old 11th October 2012, 12:15 AM   #65
PKI is offline PKI  United States
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From what I see they use different values for resistors, not original. Or I have wrong spreadsheet :-(
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Old 11th October 2012, 12:21 AM   #66
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wich schematic are you looking at?
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Old 11th October 2012, 12:52 AM   #67
PKI is offline PKI  United States
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Original? -- from A60 manual. It should be in the first post. I do not have schematics for BGT boards.
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Old 11th October 2012, 01:12 AM   #68
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remember that brian have only spreadsheet/schematic for aleph30. not aleph60.
so some resistor values will be different. like R19 and R21 from the A60 schematic. and R22-R27. A60 use 6x 1ohm. A30 use 6x0R47.

Last edited by AudioSan; 11th October 2012 at 01:15 AM.
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Old 11th October 2012, 05:55 AM   #69
PKI is offline PKI  United States
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Ok, I got it. Will post correspondence tomorrow (for future DIYers). Have two questions: the value of R16(R17 on pcb) should it be 221 like on A60 schematics or 392 as in BrianGT spreadsheet? Another, there is no matching resistor R1* on the boards, only R8(R6), is it enough?
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Old 11th October 2012, 06:25 AM   #70
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it is R18 on the PCB that is 392ohm. R17 is 221ohm.
you can do without the R1. its not used on the A2 or A30.
the whole front-end part is the same for all aleph's exept aleph-J. and exept bias and offset resistors. and the 3W resistors can go from 0R47 to 1R0.
other then that, all changes is in the output stage. as far as i know.
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