Dirty Boost Recommendations (One Knob or Less)

[Aleph Null]

I'm looking for a circuit that will provide a non-clean boost. I want a little color and grit, but not so much that it could be classified as an overdrive or distortion. The fewer knobs the better. What projects should I be looking at?

[matmosphere]

I built an Acapulco Gold a while back. It might be a little dirtier than you're thinking, but it sounds nice.

[jposega]

A copy of the Southampton Fifth Gear which I believe is the same or almost the same as the Earthquaker Speaker Cranker... it's a modified Electra Distortion.

[Aleph Null]

I've definitely looked at the Acapulco Gold and Electra variants. Isn't the Acapulco brutally loud? I've seen people saying you can drive speakers with it. I'll look into the Fifth Gear.