Dumble 102 & Frequency analyser. A rabbit hole

[frusciante89]

Hi guys! I spent some time today playing with my new Dumble 102 build and with an Analog Discovery analyser. I found a great video a while video talking about a spectrum analyser add-on, so I thought I would give it a try. Thanks for Dave Edwards for the amp and for the help; the video is below:
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No need to tell you that what followed was a proper rabbit hole that lasted a full afternoon. I'm sharing here some results in case it can be of help the plots follow more or less what is seen in that original video.
I've added the settings of the amp in each picture. For reference, I'm using a 4Ohm dummy load. All values below are out of 10. I'm reference the AA Electronics schematic component numbering.


Clean channel tests: 1000Hz, 100mV Sine input signal fed at guitar input. Output taken at after capacitor C4

Normal input, Volume 3; Treble 5; Middle 5; Bass 5; bright OFF; deep OFF; rock mode OFF;



Normal input, Volume 3; Treble 5; Middle 5; Bass 5; bright OFF; deep OFF; rock mode ON;



Normal input, Volume 3; Treble 5; Middle 5; Bass 5; bright OFF; deep ON; rock mode ON;



Normal input, Volume 3; Treble 5; Middle 5; Bass 5; bright ON; deep OFF; rock mode OFF;



Normal input, Volume 3; Treble 10; Middle 0; Bass 0; bright OFF; deep OFF; rock mode ON;



Normal input, Volume 3; Treble 0; Middle 10; Bass 0; bright OFF; deep OFF; rock mode ON;



Normal input, Volume 3; Treble 0; Middle 0; Bass 10; bright OFF; deep OFF; rock mode ON;



FET INPUT, Volume 3; Treble 5; Middle 5; Bass 5; bright OFF; deep OFF; rock mode ON;

[frusciante89]

PAB Boost tests: 1000Hz, 100mV Sine input signal fed at guitar input. Output taken at Ratio pot Pin3


Normal input, Volume 3; Treble 5; Middle 5; Bass 5; bright OFF; deep OFF; rock mode ON; level 4; PAB boost OFF



Normal input, Volume 3; Treble 5; Middle 5; Bass 5; bright OFF; deep OFF; rock mode ON; level 4; PAB boost ON



Presence Tests: 1000Hz, 100mV Sine input signal fed before C11 (PI). Output taken at the speaker

Presence 0



Presence 10

[frusciante89]

Overdrive channel tests: 1000Hz, 100mV Sine input signal fed at guitar input. Output taken at Ratio pot Pin3


Normal input, Volume 3; Treble 5; Middle 5; Bass 5; bright OFF; deep OFF; rock mode ON; level 4; PAB boost OFF


Normal input, Volume 3; Treble 5; Middle 5; Bass 5; bright OFF; deep OFF; rock mode ON; level 4; PAB boost ON


OD isolated: 1000Hz, 100mV Sine input signal fed before R6, output taken at the Ratio pot Pin3

[frusciante89]

Full amp tests (Robben Ford style setting): 1000Hz, 100mV Sine input signal fed at guitar input. Output taken at speaker output


Normal Input, CLEAN Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; master 5, presence 4; PAB boost OFF



Normal Input, CLEAN Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; master 5, presence 4; PAB boost ON



Normal Input, OD Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; level 4; ratio 5; master 5, presence 4; PAB boost OFF



Normal Input, OD Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; level 4; ratio 5; master 5, presence 4; PAB boost ON



FET Input, CLEAN Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; master 5, presence 4; PAB boost OFF

[frusciante89]

Harmonics tests (Robben Ford style setting): 1000Hz, 100mV Sine input signal fed at guitar input. Output taken at speaker output


Normal Input, CLEAN Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; master 4, presence 4; PAB boost OFF



Normal Input, CLEAN Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; master 4, presence 4; PAB boost ON



Normal Input, OD Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; level 4; ratio 5; master 5, presence 4; PAB boost OFF



Normal Input, OD Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; level 4; ratio 5; master 5, presence 4; PAB boost ON

[frusciante89]

Waveform scope tests (Robben Ford style setting): 1000Hz, 100mV Sine input signal fed at guitar input. Output taken at speaker output


Normal Input, CLEAN Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; master 5, presence 4; PAB boost OFF



Normal Input, CLEAN Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; master 5, presence 4; PAB boost ON



FET Input, CLEAN Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; master 5, presence 4; PAB boost OFF



Normal Input, OD Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; level 4; ratio 5; master 5, presence 4; PAB boost OFF



Normal Input, OD Channel, Volume 3; Treble 3; Middle 4; Bass 6; bright OFF; deep OFF; rock mode ON; level 4; ratio 5; master 5, presence 4; PAB boost ON

[pullshocks]

Thanks for posting this. What is the frequency analyzer program, an are there any adapters or interfaces needed to use it.?

[frusciante89]

I'm using an Analog Discovery with a software called Audio Analyzer Suite. It’s a hifi enthusiast custom build.

[splgeo]

I'm using an Analog Discovery with a software called Audio Analyzer Suite. It’s a hifi enthusiast custom build.

Glad I could be of inspiration

[frusciante89]

I'm using an Analog Discovery with a software called Audio Analyzer Suite. It’s a hifi enthusiast custom build.

Glad I could be of inspiration

Definitely!!!