As I mentioned earlier, quite a few brands make Dumble clones (more or less), and it wouldn’t be too hard to find one of these amps for yourself. Also, if you own a Kemper or a Neural DSP Quad Cortex, you can find some original Dumble profiles, so (theoretically) you should be able to get an idea of that sound. It’s never going to be like “the real thing”, but “the real thing” costs $100k, so…