Aleph 60 building thread

[toufu]

Originally Posted by AudioSan

aleph2 is not aleph60. aleph2 is a 100W classA amp.

Thanks... Is Aleph 2 just an Aleph 60 with higher bias and rails?

[AudioSan]

yes. more or less

[PKI]

I am trying to map an original schematic onto the boards.

[toufu]

Originally Posted by PKI

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.

[PKI]

From what I see they use different values for resistors, not original. Or I have wrong spreadsheet :-(

[AudioSan]

wich schematic are you looking at?

[PKI]

Original? -- from A60 manual. It should be in the first post. I do not have schematics for BGT boards.

[AudioSan]

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.

[PKI]

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?

[AudioSan]

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.