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Yamaha yg15 schematic needed

I acquired a Yamaha yg15 amp. The power transformer is toast. I'm looking for a schematic for it. I've been all over the internet without any luck. What I'm mainly looking for is the output voltage on the rectifier circuit. Thinking about battery operated.

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Permalink Reply by robert jones on May 18, 2019 at 12:31pm

Google "MA104 mod", you'll be pleasantly surprised if you try it. I snatch up every First Act MA104 I can get my hands on now, do the mod and shove the guts into Acid Cigar boxes

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Permalink Reply by KOOL DOG HOOCH on May 18, 2019 at 2:27pm

I'm looking into it. Thanks

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Permalink Reply by Paul Craig on May 19, 2019 at 7:31am

The MA-104 is the one I got. I just changed that input cap to a 2-way switch with the original .047 on one side and a .1 on the other side. The speaker was a large Subwoofer from a TV Surround Sound System. With the Gain turned down and the tone at 50%, you can get great acoustic guitar amp sound with your piezo CBG or plug in a Bass. Just dial up a little Gain for some fuzz effect.

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Yamaha yg15 schematic needed

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