Does anyone have a schematic for a TYM Big Bottom?

[BoatRich]

Or an idea of how to approximate it? A ton of my favorite players use one, and the idea of a blend with a crossover is great. I have a DIY clean blend laying around but I’m not sure on next steps

[calfzilla]

I think his riveted enclosures keep a lot of people out.

[BoatRich]

Ahh that’s a bummer, I’ve never had anything he’s built. I mean it can’t be much more than a low pass filter on the clean side with a high pass on the effected side though?

[BetterOffShred]

I would guess it's a split and blend in between a couple of buffers with a volume control for each part rather than a mix .. it just has a send and return and volumes for the loop and the "amp out" aka master .. there is probably some low end filtering via smaller value caps for the loop section I would wager, and giant caps for the "straight through" signal to preserve all the bass frequencies .. I would love to see in one though for sure

[Jero]

I think his riveted enclosures keep a lot of people out.

most rivets are pretty easy to remove/replace, but you are probably correct

[coupleonapkins]

Mebbe an Xotic X-Blender?

[calfzilla]

I think his riveted enclosures keep a lot of people out.

most rivets are pretty easy to remove/replace, but you are probably correct

It might be more of the mystery of what they are attached to. Is there a fail safe system where if the rivets are popped the board breaks apart? Does it set off napalm inside, burning all the traces? It could release an Aussie hellbeast for all we know.

[crochambeau]

Going by ad copy I would guess there's an active crossover section that sends the high pass along the effects loop and treats the low pass as "clean" feeding a standard blend control.

Tons of examples of a Linkwitz-Riley circuit (often with PCB) if you limit your search to just a two way crossover. Can also be done with other filter types (butterworth, bessel, state variable) but, so far as I understand it, you'll run into less phase issues with an L-R.... ...not that anyone can expect a pedal chain to spit out phase coherent signal.

From there it's a matter of choosing your crossover point and building a simple sum section to knit the two channels back together.