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Dumble - Overdrive Special 100 (serial # 173 - Like New Mint Condition)
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 | | | |  | | Ultra Sound owns several very rare original Dumble amps and has sold many others to famous artists, tone connoisseurs and amp collectors. Dumble and Trainwreck are the two most valuable and sought after guitar amps of all time and Ultra Sound is your best source for both. Serious inquiries only should be emailed to ultramusic@nyc.rr.com or call Gene at 212-967-5626.
Dumble amplifiers were custom manufactured in very limited numbers by Alexander Dumble of California who is considered by many to be a genius in amplifier design and construction. The amplifiers are famed for their sound that is very responsive to the touch and feel of the player and for their characteristic smooth overdrive distortion tone. Their clean sound is clear, defined, and well-balanced, offering good presentation of all the frequencies with coherent fundamentals. Dynamic response maintains all the subtle nuances of playing from top to bottom voices in both clean and overdriven tones.
Dumble ODS100 serial number 173 is the most magical sounding 6L6 powered Overdrive Special that I have ever heard and I have owned and sold a lot of them. This amp has everything most players search for but rarely find in a single Dumble amp. It was made during the Golden Period when Alexander built his finest sounding amps and the lead voice had reached full maturity and smoothness. The clean tones are perfectly balanced with rich midrange complexity and thick harmonics bloom as the clean notes ring out. Wow - this amp can sustain a completely clean note for much longer than any amp I have ever played - the sound just lasts and lasts. The super fat, creamy smooth hi gain overdrive tone is truly jaw dropping with amazing touch sensitivity, dynamics, articulation and speed. The harmonic complexity of the overdrive coats every note and the sustain is infinite at any volume soft, medium or loud.
ODS# 173 is even more special and extremely rare because it has the same type of choke used in Robben Ford’s ODS100. Dumble used a power resistor instead of a choke transformer in the power supply in order to induce more "sag" in the ODS100. There are only a small number of Dumble amps that were ever built this way and only a few during the Golden Period. I have personally tubed, biased, adjusted and voiced the amp using the very best rare New Old Stock tubes from my personal collection including Mullard, Amperex Bugle Boy, RCA preamp tubes and Phillips 6L6GC power tubes. The cost of these tubes alone is around $800 but to use anything less in this masterpiece would be sacrilege. One last thing - This amp is Like Brand New - Dead Mint - 10 out of 10 condition.
There are two inputs: a "normal" input and FET input where the signal from the guitar goes to a J-FET line level booster pre-amplifier before entering the first tube stage (originally intended for use with acoustic guitars and other instruments with low output levels). The first tube is followed by a passive tone stack with adjustments for treble, middle, and bass. Tone switches include Bright (bypasses the volume potentiometer with a capacitor to boost the high frequencies), Mid (increases the value of the treble capacitor to boost the midrange frequencies), Boost (disconnects the treble potentiometer from the bass potentiometer for a preamplifier level boost), Rock/Jazz (switches between a Fender-esque voicing and a more "hi-fi-type" of voicing). The tone stack is followed by another clean preamplifier stage. The resulting signal is either fed straight into the power amplifier ( clean channel), or into the (two-stage) overdrive section. The power amplifier uses a standard long-tail pair phase inverter with negative feedback. It will break up, but only at very high volume levels, or when the preamplifier "boost" switch is engaged.
Dumble ODS100 # 173 is a Magnificent Amplifier and one of the best sounding and most valuable Dumbles ever made with Holy Grail tone.
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| | | | | | Sales Price: $48,500 - SOLD | | | | | |
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