Yes, layout is verified, I have built it !

Hidden parts of Sansamp Classic :

There are still some wrong bits to the puzzle ;-) There is no 47n followed by a 100k to ground between U9a and U9b in the "secret" section - U9a output connects directly to U9b input ;-) I wonder what those 14 pin devices with the sanded tops are - they appear to be supplied by the +5 and...

Final schematics is not verified.
I will post it as soon as possible

Final PCB for replace the module

Inside the mystery box

radiographie of the mystery black box in PSA 1

Sprintlayout files:
https://www.dropbox.com/s/8pfr1gxcm4lv5 ... .lay6?dl=0
https://www.dropbox.com/s/ncf1dt8rx0v9f ... .lay6?dl=0
This work was initiated by dimebuGG.

Corrected version 1.2, after building and checking proto.

I have found some mistakes on schematic, see red circles on it:
https://www.dropbox.com/s/1fkfnx1pwjztf ... s.JPG?dl=0

Famous preamp HT supply I have gooped

C6 is a 2.2µF/50 electrolitic capacitor

Updated version and original file Sprint layout:
https://www.dropbox.com/s/dwohlajxkgkh5 ... .lay6?dl=0

Sprint Layout file: Minor change ( add of gain trim wiring location)

Ready for new customisation!

PCB redraw with smd straps. Frontplate

Prototype:

This is secret part of red ecstasy:
https://www.dropbox.com/s/0ehinjrbukbqn ... d.pdf?dl=0

guiddruid wrote:the diodes on oa2.2 in the tri-ac circuit don't look right.

A corrected version of russian schematics with PCB pics of the tri-AC:
https://www.dropbox.com/sh/8ry23ui19rlh ... ExCqa?dl=0

An important consideration in the redrawn schematic of Dimebugg is clipping diode in 3 OPA feedback who are 3V3 zener diodes. I see some mistakes on capacitors values next to Drive and Crunch control . I will try to scan a corrected version next days. I remember that I have a radiographie of the bla...

The schematic of a popular rack ac filter and surge protection:
https://www.dropbox.com/s/u6qyatirtyg94 ... tector.pdf

I have mesured value of the California Joyo: +------------------------------------------------------+-------------------------------------------+ | T e c h 2 1 | J O Y O | +---------+---------+------------+-----------+---------+----------+---------+------------+---------+ | Blonde | British | Califo...