• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Yaquin MS-12B preamp

Hi everybody,

I just finished up performing some modifications on my MS-12B. I replaced some caps and resistors.
I'm getting wonderful sound from the cd input. The phono input not so good. I barely get a sound even with volume knob turned all the way up. And even then it's very muffled. This is my first go at this. Anybody out there with this unit that could point me in the right direction of what to look for as possible problems?

Thanks,
Rick