The Mastro Fuzz Tone distributed by Gibson was actually the first on the market ( I owned one and they sounded terrible.) There was also the Range Master from the U K, but it was more of a treble booster than fuzz, it just pumped the front end of the pre amp section.
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When I was a kid, a session guitarist who used to frequently visit Mom's studio heard me trying to play rock with a Big Muff, a Watkin's Copicat (or the studio's Groupnaster) and a very old Fender amp I was using.
He politely asked if he could show me a thing or two and I graciously accepted.
He said, (as best I can recall from 1974) "Kid, Fender is OK and all, but rock is Marshall territory. Do you see Ritchie playing Fender amps???" I shook my head no, and he continued, "That box has a real fizzy sound. You need something like this..."
And he pulled over a Marshall combo he brought and plugged me in. I guess my surprised face must have made him laugh because he was busting up at my wonder and amazement.
After a bit, I noticed he was gone and I went looking for him. Mom said he had already left, so I told her that he forgot his amp. Mom said that he didn't forget it...he had given it to me.
Years later, Mom would tell me that he told her I was enjoying that amp so much that he couldn't bear to have me unplug it. He told her, " The kid has an ear. Encourage him to keep playing. He has got more enjoyment out if that amp than I ever will, besides I have more of them laying around...he can keep it."
That's how I got my first Marshall.