Marshall MG15 (Blues Breaker as preamp mod)

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Victor Nery
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Post by Victor Nery »

Hi, everyone.

I tried to mod a MG15 clone circuit to a blues breaker to be used as the preamp. I lost a lot of the signal level. Only difference is no input resistor or capacitor jack in is tied directly to + (3) of the opamp and there's a 1M resistor tied to ground. Any input would be really appreciated. My attempt is to have clean to crunch preamp driving the power. I've kept the tonestack although I replaced marshall parts for fender ones as in Duncan's Tone Stack Calculator.

Thanks in advance

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Manfred
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Post by Manfred »

Victor Nery wrote: 20 Jul 2021, 14:43 Hi, everyone.

I tried to mod a MG15 clone circuit to a blues breaker to be used as the preamp. I lost a lot of the signal level. Only difference is no input resistor or capacitor jack in is tied directly to + (3) of the opamp and there's a 1M resistor tied to ground. Any input would be really appreciated. My attempt is to have clean to crunch preamp driving the power. I've kept the tonestack although I replaced marshall parts for fender ones as in Duncan's Tone Stack Calculator.

Thanks in advance
Hi Victor,

A schematic of your circuit would be helpful.

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