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CW
Moderators: pompeiisneaks, Colossal
Stunning! Bet it sounds great!Charlie Wilson wrote: ↑Wed Apr 05, 2023 7:03 pm Hello, I was asked to build a Dumbleator II and here is what I came up with. Had some help from a couple friends.![]()
CW
Please, tell us more about the testing... I must confess, it's a bit of a mystery to me how this thing takes a mono in and gives a stereo out, but that's just a case of following the logic of the circuit. But also, if it alters the bypassed dry tone in any way.Charlie Wilson wrote: ↑Sun Apr 09, 2023 2:14 am Thanks guys. For an enclosure I used the same one Dumble used made by LMB Heeger. You can still get them. https://lmbheeger.com/uni-pacuniversalp ... ystem.aspx
They are a bit pricy and for some reason they don't paint the inside of the enclosure anymore but they still are really nice. Circuit boards and choke are from the guy who posted the photos of the Dumbleator II over a decade ago, Brandon (Bludotone). It was very cool of him to help me out with that.Nice old NTE resistors from Ian Douglas who also let me test this thing through his amps so he knows already that it sounds pretty good.
Below is a photo of the original.
CW
Mmm... you might be right. But if the dimensional drawings are anything to go by the C3X should just about fit. A 1U rack being 1.75" externally and the choke being 1.625" (top to bottom). So a bit of a squeeze maybe, but that's what hammers are for.The Triad is too tall for that single space rack enclosure.
Genius! Sounds like the kind of thing I would do.the recovery cathode resistors should be 1.5k not 2.1k. I think he read them upside down.
You're the best, Charlie!Charlie Wilson wrote: ↑Tue Apr 11, 2023 2:48 am Hello, so Stephen I agree this does not fit the definition of a true stereo device. I would like to note that Dumble did not name it Stereo Dumbleator. As far as the choke, I have seen a Dumbleator II with a Triad C-3x choke and actually have an old one sitting on my bench but I do not believe that the one in the photo is a Triad. The Triad is too tall for that single space rack enclosure. Even the one in the photo is gooped most likely to keep the top from rattling against it. rccolgan the schematic is close. The two recovery output pots are 250kA with 270pf bright caps. The bright cap on the 10k send is a big old .027uf bright cap and the the recovery cathode resistors should be 1.5k not 2.1k. I think he read them upside down.
CW