MBP Misfit (Ibanez MT-10 Mostortion)

MichaelW

MichaelW

Well-known member
Build Rating
5.00 star(s)
Here's another one I had never heard of but @Guardians of the analog thought it would be right up my alley when he gifted me this board.
And he was spot on!

I've really been on a roll with early, obscure, Japanese overdrives (a few more build reports to come) and the Mostortion kinda fits right into that
bucket.

From the name you'd think it was a high gain pedal but it's not. It's a low gain "amp pusher" type of drive. But it also sounds lovely on it's own.
The break up is "unique" and think that has a lot to do with the 3260 opamp. (Which Chris was kind enough to send along with the PCB).

I'd love to build @Robert 's version, the Oxide Drive, but I'm not sure if I would be able to find another 3260.
The 3260 is just 2x 3130's. I was thinking of maybe trying one of those Dual DIP 8 to single adapters, I wonder if that would even work running 2x 3130's? Anyway, another project for another day!

In the meantime, I'll enjoy this one, thanks Chris!

Another "raw" enclosure. Sign of the times I suppose......lol.

IMG_8267.JPG


I'm just now realizing how ugly that 3DPT wiring is......ugh.....sorry to subject you all to that.
IMG_8266.JPG
 
The AionFX Quantum is yet another PCB for this circuit. I built two of those back in 2020. I ultimately sold them, then later decided I wanted to revisit that circuit, so I built the PedalPCB Oxide.

Fun trivia: the Karma MTN-10 is a current-production clone of the Ibanez MT-10 Mostortion. The original PCB used in that pedal was designed by Kevin of AionFX. (Sorry, I can't recall the source for that factoid.)
 
MattG said:
The AionFX Quantum is yet another PCB for this circuit. I built two of those back in 2020. I ultimately sold them, then later decided I wanted to revisit that circuit, so I built the PedalPCB Oxide.

Fun trivia: the Karma MTN-10 is a current-production clone of the Ibanez MT-10 Mostortion. The original PCB used in that pedal was designed by Kevin of AionFX. (Sorry, I can't recall the source for that factoid.)
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Where did you find the 3260's?
 
MichaelW said:
Where did you find the 3260's?
Click to expand...

I reviewed my order history, looks like I only ever had a single 3260. That was from Mouser, back in 2020, part number 968-CA3260EZ (this link might work). But Mouser now shows that as "Restricted Availability: Mouser does not presently sell this product in your region." (My region is Chicago-area USA.)

My most recent build (PPCB Oxide) used a boring ol' 4558. Based on Internet hearsay, in this circuit, the opamp characteristics only come into play at the highest gain levels (at lower levels, it's just diode clipping). This is what Kevin has to say:
Instead of the relatively rare CA3260, you can use any other dual op amp—it’s the standard pinout. It won’t have quite the same characteristics (there are no direct substitutes for the CA3260) but you should be able to get really good sounds even out of the typical JRC4558. One potentially suitable MOSFET-based substitute is the TLC2262, which is a rail-to-rail op amp.
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