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Mad Professor Simble

PostPosted: 27 May 2014, 22:36
by ipm
Anyone?
I would really like to know what is it all about!

Re: Mad Professor Simble

PostPosted: 01 Jun 2014, 07:30
by Jone the Bone
Simble is a new Dumble-amp sounding overdrive pedal, originally designed by Finnish audio engineer, Lassi Ukkonen.

http://www.simbletone.com/

Lassi made the first versions by himself, but now the Simble belongs to Mad Professor's pedal range. Price about 200,- eur.

Controls corresponds to the Hermida Audio Zendrive's pots, differently named. So, my loose guess is, that the Simble is very close cousin to Zendrive.

Re: Mad Professor Simble

PostPosted: 01 Jun 2014, 14:49
by triplesevener
Not just that, given the one gutshot we've seen (of the back of the board), 3 of the 4 pots are the same value as a Zendrive, the one difference being a 1M gain pot.

Re: Mad Professor Simble

PostPosted: 01 Jun 2014, 15:25
by andregarcia57
great sound....


Link

Re: Mad Professor Simble

PostPosted: 01 Jun 2014, 17:59
by Ripdivot
It does sound nice. Seems to have more mids than a Zen. The type of mids that want to transition to controlled feedback very easily.

Re: Mad Professor Simble

PostPosted: 01 Jun 2014, 21:55
by roseblood11
Maybe he changed the direction of the mosfets? The zendrive just uses the clipping of the body diode... if you turn them around, you get a better bass response, and a little less distortion, so a 1M gain pot would make sense.

Re: Mad Professor Simble

PostPosted: 04 Jun 2014, 23:20
by micromegas
Comparision clip:


Link

Re: Mad Professor Simble

PostPosted: 05 Jun 2014, 03:19
by Ripdivot
That's a great demo. Thanks for posting. During the part played over the backing track it's not quite fair because the zen is slightly quieter. The zen is a little dirtier and more compressed.

At the end where the pedals are compared without the backing track they sound very similar. The Simble is a little more open sounding and has better bottom end which you can hear when he plays the G chord.

Re: Mad Professor Simble

PostPosted: 05 Jun 2014, 03:21
by Ripdivot
I'll add that the demo makes me feel more content with my zen. The gas is going away.

Re: Mad Professor Simble

PostPosted: 06 Jun 2014, 01:22
by roseblood11
Try this on the zendrive, I guess it's the "Simble Mod"...

Re: Mad Professor Simble

PostPosted: 08 Jun 2014, 14:27
by rs
Over here there are some demos and some info aswell as gutshots.
http://d.hatena.ne.jp/toy_love/20140503/1399127207
Cheers.

Re: Mad Professor Simble

PostPosted: 08 Jun 2014, 16:55
by 1oldsidewinder
That shot of the corner of the board with the transistor and diodes is interesting. Looks like a series resistor combined with a diode (D1) and the transistor. The other diode looks to be labeled D8 and may serve a different purpose. So what are we looking at; a buffer w/ protection diode or maybe half of the clipping diode array? Kind of curious that it's not gooped there if it is part of the array.

Re: Mad Professor Simble

PostPosted: 08 Jun 2014, 23:16
by John G
Hi,
Just a thought................could that transistor and diodes etc be part of the LED control cct concidering there is only a DPDT stomp switch fitted.
This may also explain the latency with the LED when switcihed.
John

Re: Mad Professor Simble

PostPosted: 10 Jun 2014, 17:18
by alkuz1961
I think it's just Millennium Bypass
Image

MP Simble OD with weird surface mod (from factory)

PostPosted: 12 Jun 2014, 07:54
by Richard Lainegard
Hey guys, registered a new user (since I've changed my surname since last).
ANyways, I posted a pic of this Simble PCB on my FB-page, and Delaney (Effects) suggested
I also post it here, since there was apparently a reverse engineering going down on this pedal.

So here is the pic in question. Any idea what this mod is?
Was is a last minute revision to the V.1.1 board and they wanted them
to go out, and didn't want to wait for a V.1.2 board (There has after all been
quite a buzz around these). Delaney's guess was a iltering sub circuit of some kind,
such as a bleed fix or a noise filter.
Simble PCB.JPG

Re: MP Simble OD with weird surface mod (from factory)

PostPosted: 12 Jun 2014, 09:02
by JOHNO
Looks like it might be for the lighting led when the pedal is switched on. Rat style or millenium bypass?

Re: Mad Professor Simble

PostPosted: 12 Jun 2014, 20:32
by okgb
I'd love to see , circuit wise what the difference is , whether level differences or circuit values
I thought the simby sounded fuller while the zen was brighter [ by a little ]

Re: MP Simble OD with weird surface mod (from factory)

PostPosted: 13 Jun 2014, 01:03
by lead2203
JOHNO wrote:Looks like it might be for the lighting led when the pedal is switched on. Rat style or millenium bypass?


Yes..You can see the FET on the board is removed. Its just a quick fix for the bypass LED.

Re: Mad Professor Simble

PostPosted: 15 Jun 2014, 09:03
by Jone the Bone
There is a pic of Simble's pcb, found from the net. I'd like to see more pics, component side too.

simble_pcb.jpg

Re: Mad Professor Simble

PostPosted: 17 Jun 2014, 12:39
by MoonWatcher
Jone the Bone wrote:There is a pic of Simble's pcb, found from the net. I'd like to see more pics, component side too.

It looks like there's a DIP8 config for an op amp sort of in the middle there - looks like pin 4 connects to what is probably ground.

I don't see what appear to be any other possibilities for an op amp, but uniform resistor spacing can make that hard to tell. Still, those who said something along the lines of Zendrive-like are probably correct, or at least something on the simpler side with an op amp as opposed to discrete transistors.

Should be a quick trace after someone pulls it from the box, assuming no goop. Does Mad Professor goop their stuff any longer? Even if so, that would probably just slow things down a little.