What is this?

[ronh]

I was going through my files and found this.  I think its a fixed eq to sound like a Marshall amp. Owner name is on the file.  Is it worth putting through Spice to see what it does or will sound like?

[Box_Stuffer]

Looks like a stacked opamp gain stage. There are no controls at all - not for EQ or for the amount of gain. It should produce overdrive or distortion tone. You would need a volume/level control at the end or it will be super loud.

[Rob Strand]

It's the speaker simulator circuit which was incorporated into Marshall JTM30 amplifiers.

Way back around 1999/2000 Ed extracted off the speaker sim circuit and made stand-alone speaker sim box out of it.

There's a different speaker sim in the JMP-1 preamp (and maybe JMP 2203? or something amplifiers).

Then there's the Marshall SE100 speaker simulator.


They all have similarities and differences.