Hello. Can anybody send me the user manual? Original name SMK-III.pdf Thanks!

Quote:   op275 is not a good choise. i prefer ad826 in i/v section, lme49860 in a filter and ad823 in a headphone amp Quote: yes, but you can upgrade your dac having replaced r-core with a two toroid transformers. and, also, you need an EMI filter that was missed in hlly  ...

Can anyone measure the voltage on their i/v or filter opams? 27,6V (+ - 13,8V) in my case. Is that too high?

Quote: i think OSX correctly set output level to 100% to avoid degradation of signal quality

Quote: Using opa627 in filter is not a good idea. Good combinations ad8066 i/v, ad8620 filter ad8620 i/v, ad8620 filter ad8066 i/v, op2132 filter ad8620 i/v, op2132 filter opa627 i/v, ad8620 filter opa627 i/v, op2132 filter