I would think any recent (II or newer) Mark series or maybe a Maverick would be a better choice than an LSS for a Dumble tone. From what I've heard of Dumbles, they pretty much sound like a Mark with weaker filtering. Noisy, too -- a proper printed circuit board is really a better construction choice for amps with this sort of gain structure, though I can't fault Dumble too much for this -- hand-wiring is certainly more economical for him considering the small number of amps he's made.