Mg15cdr

[Gold_xyz]

Hallo ! 😀

I need to replace all IC of a guitar-amp of a friend... 🙄
The amplifier is a Marshall MG15CDR but on the schematics
there is alone three NJM4558.
vice-versa on new MG15CDR there is an TL072 and two NJM4560.

The question is : Where do I have to put the TL072 ?
i have forgot this...

 

[Enzo]

It doesn't matter. Make all three 4560 if you like, or go back to all three 4558, or make all three TL072, or mix them. That is just a basic little practice amp, and the parts are not critical. I suppose if I had to make a preference, I would stick the TL072 in the first stage at the input.

 

[Gold_xyz]

Thanks for the answer ! 😀

I also think me that it is better to put the TL072 as an input stage.

This is the input stage wit new ampop IC

An externally hosted image should be here but it was not working when we last tested it.