Dumbleator Layout

Dumble schematics, designs, pictures. Only members may post files here.

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talbany
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Dumbleator Layout

Post by talbany »

Dumbleator..
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Last edited by talbany on Sat Nov 20, 2010 4:04 pm, edited 1 time in total.
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Mark
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Re: Dumbleator Layout

Post by Mark »

all good.
Last edited by Mark on Tue Jan 08, 2013 6:21 pm, edited 1 time in total.
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Mark Abbott
grtamp
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Re: Dumbleator Layout

Post by grtamp »

Hi talbany , great work and clear layout! , there is a schematic or layout with serial/parallel mode well tested?
Thanks
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Structo
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Re: Dumbleator Layout

Post by Structo »

Here are some more diagrams.

The Series/ Parallel layout is UNTESTED so builder beware.

But you can see how the bypass switch is wired.
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Last edited by Structo on Tue Mar 26, 2013 6:55 pm, edited 3 times in total.
Tom

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Structo
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Re: Dumbleator Layout

Post by Structo »

This is the one I built using a Fender standalone power transformer.

So pay attention to the resistors and power supply.
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Tom

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JazzGuitarGimp
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Re: Dumbleator Layout

Post by JazzGuitarGimp »

Both of the schematics here seem to have an error. I think the 10M / 22nF / 10M string from the plate of V1B should return to the grid, not the wiper of the Return Level pot. Please correct me if I am wrong.
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martin manning
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Re: Dumbleator Layout

Post by martin manning »

I believe that is the way HAD did it, since the schematic was provided by someone who claimed to be among the illuminati. As shown it rolls off about 3dB at 10 kHz vs. taking the NFB to the grid.
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JazzGuitarGimp
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Re: Dumbleator Layout

Post by JazzGuitarGimp »

Hi Martin,

Thanks for the info. My point of reference is from some of the D-Style amp schematics that I've studied - they have the network connecting directly to the grid. Is there a chance the amp schematics are wrong?

Just seems odd...

Thanks,
Lou
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Mark
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Re: Dumbleator Layout

Post by Mark »

I built a Dumbleator from a D'Lite kit. I like the way they thicken up a non HRM amp, I'm not a big fan of the Dumbleator with the HRM amp.

[img:1024:768]http://i149.photobucket.com/albums/s69/ ... CN4064.jpg[/img]
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steve_p
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Re: Dumbleator Layout

Post by steve_p »

Mark wrote:I built a Dumbleator from a D'Lite kit. I like the way they thicken up a non HRM amp, I'm not a big fan of the Dumbleator with the HRM amp.

[img:1024:768]http://i149.photobucket.com/albums/s69/ ... CN4064.jpg[/img]
Where's the tube?
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jelle
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Re: Dumbleator Layout

Post by jelle »

In the black box on the rear.
Mark
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Re: Dumbleator Layout

Post by Mark »

I made this up for someone, they didn't like the idea of having to pull the whole thing out of the case and open it up so they could replace the tube. The black box offers the tube some protection. I've put the picture up as I think that it is a worthwhile modification to the Dumbleator.
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jelle
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Re: Dumbleator Layout

Post by jelle »

JazzGuitarGimp wrote:Hi Martin,

Thanks for the info. My point of reference is from some of the D-Style amp schematics that I've studied - they have the network connecting directly to the grid. Is there a chance the amp schematics are wrong?

Just seems odd...

Thanks,
Lou
Both schematics here are right. I have verified it against a few Dumble amps and one Dumbleator in real life. Jelle
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Chris Brown
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Small Footprint layout using Stand Alone Reverb Transformer

Post by Chris Brown »

Here's my contribution...

Standalone Reverb Transformer / Choke / 10x5x3 Hammond Enclosure
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angelodp
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jacks

Post by angelodp »

Chris, in you version of the Dlator, it appears that you are grounding the jacks at the sleeve through their connection to the chassis. Some builds have discussed isolating the jacks. Have you had any issues your way…loop hum?

Ange
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