I was having issues with mono Jamma no sound/buzzing but if i hooked up sound via the RCA connectors i had no issues. Obviously i also wanted mono sound to work for my jamma pcb's.
@Hatsune Mike made a thread about his issues last year and it really helped me out. Orginal thread Sega Model 3 (Blast, NVS4000, etc) no JAMMA sound / buzzing fix
I replaced vertical R1 resistor on my amp (10 Ohm) and my issues went away. When I pulled the old resistor i thought it checked good but replaced anyways and it definitely solved my problems.
Thanks and good luck to whoever needs this post in the future.
@Hatsune Mike made a thread about his issues last year and it really helped me out. Orginal thread Sega Model 3 (Blast, NVS4000, etc) no JAMMA sound / buzzing fix
I replaced vertical R1 resistor on my amp (10 Ohm) and my issues went away. When I pulled the old resistor i thought it checked good but replaced anyways and it definitely solved my problems.
Thanks and good luck to whoever needs this post in the future.
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