From what I see they use different values for resistors, not original. Or I have wrong spreadsheet :-(
Original? -- from A60 manual. It should be in the first post. I do not have schematics for BGT boards.
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.
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.
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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?
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.
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.
Nope 🙂 I am looking at the spreadsheet now: R17, R18 are 392, but with the comment: initial value, could be optimized for expected power/load conditions for R17.
on the schematic i got for A30, it is only R18 that is marked 392ohm. but i see R17 is marked 392ohm on the spreadsheet for A30. however. it is marked 221ohm on the A60 schematic.
so if it is A60 you are building. stick with 221ohm.
so if it is A60 you are building. stick with 221ohm.
Thanks, I will go with 221 first and then will see!
There is only one thing between me and assembled A60 bock — wires. Bought 12awg teflon wires, but the strands are covered with some "silver" metal that does not soldering well :-(.
There is only one thing between me and assembled A60 bock — wires. Bought 12awg teflon wires, but the strands are covered with some "silver" metal that does not soldering well :-(.
another reason to stick with good old trusty copper😀
i just take a extention cord wire with 3x1.5mm2 and strip it🙂
but for the A60 you can go for something a little more beefy.
i just take a extention cord wire with 3x1.5mm2 and strip it🙂
but for the A60 you can go for something a little more beefy.
Guys, what to do with R19(R13 pcb). It's 5622?! I have a multiturn trimmer for 10k, or find something else?
I have 12awg, 14awg and kimber 19awg wires. Which are better suit for +s, +g? I am thinking of 12awg for +c, +v and smaller diameter for other two.
look there
http://www.diyaudio.com/forums/pass-labs/58758-pass-labs-x2-rev1-relays-2.html#post2518092
I think Pass forget to translate R19 and R21.
When I will do my Aleph60 I will try R21 1,5k and R19 56,2k
I`ve looked at the serive manual from the Aleph30 there R19 is 47,5k
why should it be so much different in the 60?
I will try when time is come hopefully my Amp dosn`t burn down 😀
greets Alex
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