DUMBLE LAYOUT PDF

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A distortion stompbox inspired by Dumble amplifiers by runoffgroove. The runoffgroove. One of us owns the Behringer unit that has another digital model of these amps. Between the two of us, we also have several recordings of these elusive amps. Putting all that aside, we set out to distill the available information and come up with a circuit that was, at the very least, heavily influenced by the amps.

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A distortion stompbox inspired by Dumble amplifiers by runoffgroove. The runoffgroove. One of us owns the Behringer unit that has another digital model of these amps. Between the two of us, we also have several recordings of these elusive amps. Putting all that aside, we set out to distill the available information and come up with a circuit that was, at the very least, heavily influenced by the amps.

We opted for the preamp section only, since the "precision power amp" is intended to be clean and not readily distort. We named our resulting circuit Umble. Looking closely, we can see what amounts to a few Fender-style gain stages and an odd looking Fender-style tone stack.

There is nothing revolutionary about the cascaded gain stages, but the tone stack looks like it was mis-drawn. The controls become more effective and change the overall sound of the circuit in comparison to the standard Fender unit. One can also notice odd interactions of the three tones.

In our research, we have read many accounts of the actual amps that back-up this effect. A breakdown of the Umble circuit will reveal a conglomeration of several schematics available on the internet see the Dumble Amps section of Schematic Heaven for a nice assortment. We also left out all the complex switching options and hard-wired a straight-ahead sound. There are elements in the sound that are similar to some of these artists, though.

We think the Umble sounds much smoother and more like the famous recordings than the Behringer or Line 6 models, but that may be personal preferences. There is some background hiss, but not an intolerable level. Since each one is custom made, the amp sounds could be very different from unit to unit, even though they have the same model name. Our advice is to try the Umble as it is drawn.

If you think you would like something a little different, "customize" this circuit after looking at the amp schematics.

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Click on any picture to enlarge. I think I really like the change. I still was never really happy with the response of the amp. Even after extensive work it sounded like a blanket was guarding the high frequencies.

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Connected 10K resistor from Bass 1 to Ground instead of Vb. PM me if you like — lots to say. One notable original owner of a Manzamp was Bonnie Raitt. These models amount to general circuit styles and chassis layouts:. Newer Post Older Post Home.

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