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Shredmaster versions

PostPosted: 04 Feb 2018, 11:10
by lcv
Hi All
The first Shredmaster schematics circulating years ago , showed an inverting configuration of the third opamp (just after the tone stack).
Afterward original Marshall schematics were exclusively showing a non-inverting configuration for that opamp.

Pls. if someone knows:
Were those first schematics simply wrong, i.e. Marshall never produced a version of the SM w/inverting stage?
Is it known whether Marshall implemented different schematics during production?