Early Peavey tonestack same as Dumble?

[oldmacman]

I happened to run across a Reddit post this morning where somebody picked up an old Peavey Standard 260 amp from an antique store. Curious, I looked up the schematic (https://assets.peavey.com/literature/ma ... andard.pdf) and found that the tonestack looks just like an ODS -- based on a blackface Fender, but with the mid and bass controls separated so they're less interactive. The manual claims that "these tone circuits are identical to those used in the most popular British made amps and use the same critical component values to exactly duplicate their action and intonation," but it doesn't look like the typical Marshall/Vox setup to me. The Peavey Mace/Deuce (https://www.thetubestore.com/lib/thetub ... ematic.pdf) looks like it's the same ODS-like tone stack topology but with different values.

Did Hartley Peavey come up with the same idea as Howard Dumble independently?

[martin manning]

My guess is that topology predates both of them.