Sound City - Distortion DS-04 Traced Schematic

Manfred · Post by **Manfred** » 05 Apr 2020, 15:55

I dissected the Sound City distortion.
I made a approximate layout copy of the PCBs and traced the circuit.
The circuit of this distortion is the same as the Panther distortion except for the feedback part, the diode types and the type of operational amplifier.
I cannot figure out the JRC dating code, who can tell me the date of manufacture of the Op-amp.

Further measurements in the next post.
Ready to Print PDF-files:

SoundCityDistortionMainPCB_ComponentSide.pdf: (40.05 KiB) Downloaded 118 times

SoundCityDistortionMainPCB_SolderSide.pdf: (13.2 KiB) Downloaded 106 times

SoundCityDistortionPotPCB_ComponentsSide.pdf: (12.47 KiB) Downloaded 101 times

SoundCityDistortionPotPCB_SolderSide.pdf: (10.26 KiB) Downloaded 99 times

SprintLayout6.0-File:

SoundCityDistortionLayout.zip: (59.74 KiB) Downloaded 105 times

Manfred · Post by **Manfred** » 05 Apr 2020, 20:59

In addition, this is the difference between the two circuits.

: SoundCityPanther1stStageCompare.jpg (19.61 KiB) Viewed 1672 times

lolbou · Post by **lolbou** » 06 Apr 2020, 08:45

Very close to the Electra 500 Distorsion (and its siblings) too!

Very good job Manfred!

Manfred · Post by **Manfred** » 07 Apr 2020, 14:04

Here the measurements I have made:

: FrequencyReponseSoundCityDS-04.jpg (67.98 KiB) Viewed 1586 times

The comment "start clipping" to the first curve is wrong it must be "clipping".

Manfred · Post by **Manfred** » 03 Oct 2022, 21:49

There is a fault in the schematic above, the value of the DIST potentiometer is C50k not B100k.
The Layout shows the correct value.
Here the corrected schematic:

: SoundCityPantherCompare.jpg (19.87 KiB) Viewed 579 times

Sound City - Distortion DS-04 Traced Schematic [schematic]