Controls
- Input
- Level
Specifications
- Designed for a 125B enclosure with top-mounted jacks
Documentation
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PedalPCB is in no way affiliated with DUMBLE® or JHS Pedals.





Steve Walker (verified owner) –
Holy moly! This thing sounds WAY better than I expected! I’ve been playing my T-style guitar through it for a week now, and I can’t get enough. I’ve built hundreds of pedals, and this one is among the cream of the crop. Easy build and a crazy-awesome boost! Highly recommended!
Zimmie (verified owner) –
This is a hidden gem! Super easy build with absolutely fantastic results. This mimics the tube breakup of a Dumble amp. Very realistic. At least to my ear (I’ve been playing for over 50 years). If you source your componets right, you’ll be into this for about $25 (US). Well worth the money and time. If you like tube sound on the edge, you’ll love this.
Full disclosure, the hardest part of this is soldering the J309 transistor. But it’s completely doable.