Dumble Small Special 100 photos (uncensored).

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Aaron
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Re: Dumble Small Special 100 photos (uncensored).

Post by Aaron »

Thanks Brent and Colossal!

I might do a schem and layout if anyone is interested.

Thanks,

Aaron
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Structo
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Re: Dumble Small Special 100 photos (uncensored).

Post by Structo »

One thing that is nice about the jumbled mess the file section is in, it prevents the paint by number guys that don't know a thing about working with high voltages from killing themselves.

This also forces people to search for the information and not expect it on silver platter.:wink:

The Dumble Files section is actually a lot better than it was awhile back. :lol:
Tom

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Bob S
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Re: Dumble Small Special 100 photos (uncensored).

Post by Bob S »

I'm also a transplant from the TW side.
Every time I start to research in the D section, I lose 4-6 hours.
Often I forget what I was looking into in the first place.
So much information - this is a good thing.
I learn something new every time.
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LeftyStrat
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Re: Dumble Small Special 100 photos (uncensored).

Post by LeftyStrat »

I guess the one thing I would like to have is something defining "generations" and tonestacks; "classic", "pre-classic", and "skyliner."

There are plenty of threads that even have clips, but not real definitions.

What's the difference between a 2nd gen and a 3rd gen?

I've gathered enough that there are basically two power supplies, the early one and the later precision one. Does these relate to the generations? Is output power changing from 50w to 100w a generational change?
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Max
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Dumble ODS Generation Information by Max

Post by Max »

LeftyStrat wrote:What's the difference between a 2nd gen and a 3rd gen?
The term "generation" refers to ODS chassis with a very similar look that's different from the look of the previous and the next generation.

The 2nd generation ODS chassis e. g. has slide switches (see attached picture) and the 3rd generation ODS chassis e. g. has small toggle switches (see attached picture).

And in many of the ODS chassis with a similar "generation-look" - but not in all! - you'll find similar circuit specs, too - at least if they haven't been updated at same later point in time by Alexander Dumble.

In many of the 2nd generation ODS chassis you'll find e. g. this kind of circuit: http://ampgarage.com/forum/download/file.php?id=14336

And in many of the 3rd generation ODS chassis you'll find e. g. this kind of circuit: http://ampgarage.com/forum/download/file.php?id=14344

Cheers,

Max
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Last edited by Max on Wed Sep 05, 2012 8:42 am, edited 1 time in total.
jujudubluz
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Re: Dumble Small Special 100 photos (uncensored).

Post by jujudubluz »

i started a layout, never had time to finish this one...

http://ampgarage.com/forum/files/small_ ... ut_177.pdf

juju
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Re: Dumble Small Special 100 photos (uncensored).

Post by LeftyStrat »

Max wrote: The term "generation" refers to ODS chassis with a very similar look that's different from the look of the previous and the next generation.
Thanks Max. I had thought it had to do with circuits. This makes perfect sense now.
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Max
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Re: Dumble Small Special 100 photos (uncensored).

Post by Max »

LeftyStrat wrote:I had thought it had to do with circuits.
IMO it has to do with circuits. Please let me explain how by using some examples:

In more than 50% of the never updated and still all original ODS chassis with the 2nd generation look you'll find the "pre-standard" OD circuit and a version of the "pre-classic" tone stack with a Clariostat 500K treble pot and two capacitors soldered to the bass pot: http://ampgarage.com/forum/download/file.php?id=14336

In more than 50% of the never updated and still all original ODS chassis with the 3nd generation look you'll find the "pre-standard" OD circuit and the version of the "pre-classic" tone stack with a CTS 250K treble pot and only one capacitor soldered to the bass pot and Tandy Wire RG59/U foam coax cables (and no longer the Colombia Flexfoam coax cables): http://ampgarage.com/forum/download/file.php?id=14344

In more than 50% of the never updated and still all original ODS chassis with the "transition generation" look you'll find a "standard" OD cicuit, a "classic" tone stack and a "low plate" configuration similar to the circuit shown in this layout (but some with still an accent switch and without a PB relay): http://ampgarage.com/forum/download/file.php?id=14346

In more than 50% of the never updated and still all original ODS chassis with the 4th generation look you'll find a "standard" OD cicuit (some with an internal h. f. taper control trim pot), a "classic" tone stack and a "low plate" configuration similar to the circuit shown in this layout e. g.: http://ampgarage.com/forum/download/file.php?id=14346 or a "high plate" version of the circuit shown in this layout .

In more than 50% of the never updated and still all original ODS chassis with the 5th generation look you'll find a "standard" OD circuit, a "skyline" tone stack and some version of the "high plate" configuration and a precision power supply with or without a choke and white teflon coax cables similar to the circuit shown and discussed in this thread e. g.: http://ampgarage.com/forum/viewtopic.ph ... 400#143400

In more than 50% of the never updated and still all original ODS chassis with the 6th generation look you'll find a "HRM" OD circuit, a "skyline" or "bluesmaster" tone stack (with a bluesmaster PI) and some version of the "high plate" configuration, a precision power supply and white teflon coax cables - the "bluesmaster" version with a circuit similar to the circuit shown in this layout: http://ampgarage.com/forum/download/file.php?id=15545

Cheers,

Max
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Max
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Re: Dumble Small Special 100 photos (uncensored).

Post by Max »

From 4th to 6th:
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Max
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Re: Dumble Small Special 100 photos (uncensored).

Post by Max »

7th generation ODS pictures

So these are the different looks of the 100W and 50W ODS chassis I know of.

Now some kind of "caveat":

IMO one should always keep in mind when using the term "generation" that it might first and foremost be used referring to some kind of look in order to fascilitate communication by avoiding the need for a detailed description of the look of some Dumble ODS chassis.

Dumble ODS amps are all "custom made" and AFAIK their circuits are all different - some more - some less. Up to now I don't know of even two ODS amps with an 100% identical circuit and layout and with 100% identical parts. And sometimes you'll meet rather unusual ODS amps with unusual features like rotary switches in the "deep" position, custom made boost options etc. etc.

And the "sticky" ODS layouts in this files section are AFAIK (with the exception of the 124 "low plate classic" and the "Bluesmaster" layouts) all derived from unique real Dumble ODS amps and aren't some kind of "best of xy generation" collection of circuit specs. So #0182 and #0184 might have rather different circuits than the one shown in the layout of #0183 e.g.

So IMO posting or linking to a schematic and/or layout might fascilitate communication and might help to avoid misunderstandings when reporting on some new "xy generation with precision supply and bluesmaster stack" build.

Have fun!

Max
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dbharris
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Re: Dumble Small Special 100 photos (uncensored).

Post by dbharris »

Thank you very much Max. The above information is extremely helpful in clarifying some of the basic lingo used on this forum.

-Dan
stevlech
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Re: Dumble Small Special 100 photos (uncensored).

Post by stevlech »

The Small Special tonestack looks to be just like the 2nd generation minus the mid cap/pot and with only one cap across the bass pot lugs 1-3. Is this correct?
Max
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Re: Dumble Small Special 100 photos (uncensored).

Post by Max »

stevlech wrote:The Small Special tonestack looks to be just like the 2nd generation minus the mid cap/pot and with only one cap across the bass pot lugs 1-3. Is this correct?
Here you find a layout of one of the 2nd generation ODS 50W amps: http://ampgarage.com/forum/viewtopic.php?t=12870

And here you find a layout of one of the 3rd generation ODS 50W amps: http://ampgarage.com/forum/viewtopic.ph ... 261#140261

And in both threads you’ll find pictures of a 2nd generation ODS 50W and pictures of a 3rd generation ODS 50W, too.

And studying the information in these two threads and comparing this information with the pictures of this Small Special you’ll notice that the Small Special doesn’t have the James configuration at the bass pot (2nd generation ODS) and doesn’t have the big Clariostat treble pot (2nd generation ODS), either. And the capacitor at the bass pot of the Small Special isn’t wired like the capacitor at the bass pot of the 3rd generation ODS. And all the 2nd generation ODS amp I know of and all the 3rd generation ODS amp I know of have a "Middle" control.

So IMO this Small Special has neither the tonestack that you'll find in 50%+ of the 2nd generation ODS 50W amps, nor the tone stack you'll find in 50%+ of the 3rd generation ODS 50W amps.

Cheers,

Max
stevlech
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Re: Dumble Small Special 100 photos (uncensored).

Post by stevlech »

Thank you Max. As I mentioned, the cap is indeed wired across the pot (like a skyliner) and not like a James configuration. I have compared the wiring in other photos of a Small Special build (not necessarily a clone of this amp I realize) and it seems that the switch wiring is similar to the 2nd generation layout (with the switch direction changed per the chassis layout being tubes up). As far as pot values, I can't say. Your observation about the non-Clarostat Treble pot is noted.

Thanks again, Max. Your quest for clarity is appreciated.

EDIT:
Last edited by stevlech on Thu Sep 06, 2012 1:02 pm, edited 1 time in total.
Aaron
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Re: Dumble Small Special 100 photos (uncensored).

Post by Aaron »

Hi Stevlech,

IMHO, the cap across the Bass Pot looks like it connects Pin 2 and 3 together and Pin 1 might go to the .1uf cap.

There is a schem on Schematic Heaven that has a similar tonestack, but I can't confirm or deny whether it is taken from an actual Dumble amp.
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