Dumble Heaven Amp Schematics - ODS Overdrive Special Steel dumble Overdrive Specials 60's ODS Preamp 60's ODS Poweramp 60's ODS Output 70's ODS Preamp 70's ODS Overdrive 70's ODS Poweramp 70's ODS Output 97 ODS Full Schematic 97 dumble ODS Notes 97 ODS Notes: Generic dumble Circuits Dumble-ator ODS JFET Input 90's ODS Block Diagram Mods For AB763 Fenders Dumble Mod #1 Dumble Mod #2 Dumble Mod #3 SCHEMS : Dumble Amp Schematics : ODS Overdrive Special Amp Wizard Howard Dumble - 1985 Guitar Player Interview. In spite of their steep price tags--a standard 100-watt overdrive head sells for $1,925; the Steel-String Singer and Dumbleland each go for $5000 before options--Dumbles are always in demand, and Howard has his ampguy | Dumble Overdrive Clone Overdrive Special Reverb 50 watt Tube Amp. Features 2x 6L6 tubes. This Overdrive Special amp is a clone of the 80s - 90s Dumble #124 amp with our own added reverb that can be bypassed from the circuit . The footpedal also engages the 2nd channel which is the overdrive channel. This amp simulates an authentic Dumble Overdrive tone. Dumble Amplifiers - Wikipedia Dumble amplifiers are the most expensive boutique amplifiers on the used market, and prices have risen rapidly. In 2012, Vintage Guitar magazine described the Dumble Overdrive Special as the most valuable in the product line, with used amplifiers fetching between $70,000 and $150,000. Other examples have sold for more.