1988 Dumble Overdrive Special with 50 Watt switch (Rare option) The is the best era for Dumble amps the filter section was at it's zenith. The drive is untouched by any other amp. These are the most sought after amps in the world. Very few were made and this one is all original never serviced by anyone but Dumble himself. Come with an early 80's Dumble 2 X 12" cab.