SSS 01 Layout

[vibratoking]

Anybody have thoughts regarding the multi section cap? I don't know much about them, but it 3 section with ??? values? Stupid question - where is the ground attached to that cap? All 47uF?

Aaron, with all due respect I agree that one of the resistors mounted on the can cap is 1k Ohm. The other 1W resistor is probably 1k Ohm even though the 120k resistor is blocking it. But it is a good assumption you made since it is probably equal filtering sections for the power supply. The 120k Ohm looks correct. What about the resistor mounted on the terminal strip? Aaron gave it a 4k7 value, but I can't really see it?

[T Wilcox]

Aaron
In the latest layout 2 of the electrolytics in the trem/reverb board appear to be wrong polarity. + should be facing the tubes
BTW thanks and good work

Todd

[Aaron]

Just to let everyone know so that work is not duplicated. I am creating a schematic to match the layout that Aaron is currently working on. It is not close to being done, but here is what I have so far. I will update this as I move forward. BTW, I am using ExpressSCH and I will make the SCH file available for easy editing and mods by the forum.

Thanks Vibra! I was gonna do one eventually.

Also, I used the SSS 002 schem to fill in some blanks. The resistor on terminal strip looked like yellow-???-red, and the 002 schem had 4k7 so went with that.
Thanks,
Aaron

[ToneMerc]

Anybody have thoughts regarding the multi section cap? I don't know much about them, but it 3 section with ??? values? Stupid question - where is the ground attached to that cap? All 47uF?

Aaron, with all due respect I agree that one of the resistors mounted on the can cap is 1k Ohm. The other 1W resistor is probably 1k Ohm even though the 120k resistor is blocking it. But it is a good assumption you made since it is probably equal filtering sections for the power supply. The 120k Ohm looks correct. What about the resistor mounted on the terminal strip? Aaron gave it a 4k7 value, but I can't really see it?

VK, the four capacitor housing twist tabs (case ground) are soldered to a metal bracket. That bracket is secured with the two term strips screws at 12 & 6 o'clock. Hard to tell about the hidden .5W , looks like I a faint black shadow. I think 1K is a good guess and the same holds true for the 1W 4.7K I think.


TM

[Max]

Also, I used the SSS 002 schem to fill in some blanks.

To avoid later misunderstandings concerning this IMO it would make sense finding a way to mark in the layout what you are really 100% sure about that it's in the real #001 and what you've taken in a best guess manner from other Dumble amps.

Many details aren't visible on this single picture of #001 this layout is based upon. Examples: filter switches with attached parts, values of bass and middle pots (500K Clariostat treble pot is IMO obvious), power supply, ....

So IMO - to avoid misunderstandings - the layout should perhaps make clear what you are 100% sure about that it's indeed in SSS #001 and what is just based upon what is known about other Dumble amps - especially other SSSs. AFAIK these amps are all different and in addition this is #001.

So the conclusion that what's not visible on this picture will just be as in SSS #002 or SSS #004 etc is IMO questionable. As you know #002 and #004 have a different tone stack - just one example for all the differences. So IMO the conclusion that all you don't see on this picture of #001 will probably be just as in SSS #002 or SSS #004 etc is IMO questionable.

So perhaps it would make sense to post a version of this layout with blank parts and without the power supply and the filters etc in the files section and a second version as some kind of suggestion for a complete build of something what might be called "SSS #001 hybrid" or something like this.

Cheers,

Max

[vibratoking]

Max, in a perfect world, I agree with your comments about how strictly authentic the final layout and schematic will be as compared to SSS #001. Your point is well taken. Assumptions will have to be made so that the final layout will result in a fully working amplifier.

In a practical sense, documenting every nit requires quite a lot more work that may or may not take place. I am interested in creatingng a fully working schematic that is as close as I can get given the data that I have to work from - one partial picture of 001, a partial schematic of 001, a hand drawn schematic of 002, some other very low resolution pictures, comparison to other HAD circuits, and a lot of heresay. Personally, I am not interested in taking on a full, historically correct documentation task, although that would be ideal. Unless more concrete evidence appears, the result will be a mixture of pure truth and educated guesses, at best.

At the risk of offending, I would guess that there is some minor error in every schematic/layout that is posted in the files section. I would like to believe that I am wrong about this, but I am a realist. Who is able to judge accuracy, besides HAD? I am sure there are experts that believe they can, but the experts would most likely disagree judging from the history on this site. We already know that different eyes see different things in the picture of SSS #001 with regard to the tremolo. I will continue with the schematic of Aaron's layout. My goals are to develop a schematic that is 100% accurate to the layout and to help facilitate an accurate layout by double checking and asking questions regarding the true implementation. I don't anticipate anything beyond that. My experience in designing circuits has shown me that you must work with the schematic and the layout to get a full picture of any circuit. I will not be trying to drum up new information or chasing down the real SSS #001 in order to physically verify the circuit. In fact, I doubt that I will ever build SSS #001. My effort is mainly to satisfy my own curiosity regarding the circuit, to help others build something as close a possible given the current data, and help lift the veil on this elusive information. Oh yea, and to pay back something to this forum and it's membership.

[Max]

Personally, I am not interested in taking on a full, historically correct documentation task

I fully understand your personal point of view. Perhaps I just didn't make my intention clear enough:

If what in the end will be posted in the files section will be something else than what most here will think to be a 100% correct schematic and layout of SSS #001, I would propose not to name it "SSS #001". That's what I proposed. Not more - not less.

And I am fully aware, that Dumble schematics are floating around the net that AFAIK aren't correct, just because even very experienced techs are humans and we humans make faults. And by copy and paste these faults sometimes spread like the flu.

And I agree that even the layouts in our files section - like the one of #0124 e.g. - may perhaps have some minor faults that up to now haven't been noticed. But by the generosity of an owner and with the help of Gil the layout of #0124 is based on detailed pictures of the real #0124 and so IMO it makes sense to call it "#0124".

But to call some hybrid kind of layout and schematic based on only one picture of some parts of SSS #001 - and otherwise on a lot of assumptions - a layout and schematic of "SSS #001" will IMO only lead to misunderstandings.

But don't take me wrong now: I don't think that such a hybrid layout is without worth. But I think that it shouldn't be named in a way pretending to be one of the real thing. Just my personal point of view. And if you and the others here should think different concerning this, this isn't a practical problem for me anyway, as hopefully I'll still remember even in twenty years from now what this layout is and what it isn't.

Cheers,

Max

[M Fowler]

So once this is finalized are there thoughts of having pc boards made and maybe a chassis as well?

TM

Thank you to all involved with this process. I wish I had the talent to help out.

I would be interested in boards to build one of these amps purely for my own enjoyment not for capitol gain.

Mark

[dcribbs1412]

So once this is finalized are there thoughts of having pc boards made and maybe a chassis as well?

TM

Thank you to all involved with this process. I wish I had the talent to help out.

I would be interested in boards to build one of these amps purely for my own enjoyment not for capitol gain.

Mark

+1 from here...I'll use a Tube Screamer for my non-capitol gain...

Darin

[dreric]

So once this is finalized are there thoughts of having pc boards made and maybe a chassis as well?

TM

Thank you to all involved with this process. I wish I had the talent to help out.

I would be interested in boards to build one of these amps purely for my own enjoyment not for capitol gain.

Mark

Same here!

Eric

[martin manning]

Here's a working circuit for the trem. I started with the Maggie and deleted stuff that wasn't needed. It now has the right number of caps and resistors, and all the resistor values from the photo/layout, except for the 47k vs 470 for the inverter loads. The neon bulb in the opto isolator would be connected from out 1 to ground or from out 1 to out 2. The range of speed isn't that great as it is, but maybe it could be tweaked a bit.

[talbany]

Aaron
It looks to me like he ran out of room to run the PCB traces to pin 6 and possibly 7 (You run into these issues when you design the chassis first..Been there).. Probably the reason why we don't see any traces there.. We know they are hooked up so he most likely ran wires under the board for these connections..I don't know how you want to address this in the layout for the sake of accuracy..Perhaps you can do an * by the wire and create a legend with the explanation..Those that end up doing boards will no doubt add the traces..It looks to me like the B+ feeds one side of the 47k and the other side feeds the plate (pin 1) The ground (black wire) feeds pin 8

Martin you are the man!!
The 2 brown disc caps appear to be the same size..I wonder if he didn't just use 2 .047's instead of the .068..The tollerance for those old disc caps are all over the place anyway..

Tony

[martin manning]

The 2 brown disc caps appear to be the same size..I wonder if he didn't just use 2 .047's instead of the .068..The tollerance for those old disc caps are all over the place anyway..

I thought about that since they do look to be identical, but I just left the Magnatone values. There will be subtle changes in the pulse shape and duty cycle because the amount of clipping will change. They could both be 0.068uF, too...

The parts placement seems odd, like it was originally designed for some other circuit.

[BarryW]

+1 here - what a wonderful thread. Thanks to all!

So once this is finalized are there thoughts of having pc boards made and maybe a chassis as well?

TM

Thank you to all involved with this process. I wish I had the talent to help out.

I would be interested in boards to build one of these amps purely for my own enjoyment not for capitol gain.

Mark

[Aaron]

Here's a working circuit for the trem. I started with the Maggie and deleted stuff that wasn't needed. It now has the right number of caps and resistors, and all the resistor values from the photo/layout, except for the 47k vs 470 for the inverter loads. The neon bulb in the opto isolator would be connected to out 1 and out 2. The range of speed isn't that great as it is, but maybe it could be tweaked a bit.

Great work Martin!
I'm away at the moment but will update the layout when I get back
Thanks,
Aaron