Hi
I just got this vintage box, and thought it would be nice to upgrade / mod the analog part a bit. First of all, is really +/-5V all that is needed - I was thinking of upping the audio power rails to +/- 15V or no need for that ? Then, I wanted to introduce balanced input and output for getting it to interface smoother with my mixers balanced connections and for the last to replace 4558 with OPA 1612 on both input and output .
Are Q108 and Q109 muting transistors, can I ditch those as well? I got quiet of a sonic improvement by ditching muting transistors from my vintage Emu-1820m outputs.
Any ideas are most welcome. Shematic attached.
I just got this vintage box, and thought it would be nice to upgrade / mod the analog part a bit. First of all, is really +/-5V all that is needed - I was thinking of upping the audio power rails to +/- 15V or no need for that ? Then, I wanted to introduce balanced input and output for getting it to interface smoother with my mixers balanced connections and for the last to replace 4558 with OPA 1612 on both input and output .
Are Q108 and Q109 muting transistors, can I ditch those as well? I got quiet of a sonic improvement by ditching muting transistors from my vintage Emu-1820m outputs.
Any ideas are most welcome. Shematic attached.