Crate Chassis-visceration

[saturated]

I wanted to have an amp chassis I could put on the bench and maybe accomplish a few sorely needed achievements
-be able to look at any component and identity it moreover locate it on the schematic
-identify the components of the power supply
-determine the route of the signal path
-do some signal tracing

The amp works I tried it a while back it is missing a speaker

Beautiful ain't it

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Well that didn't take long (I had to be careful not to scratch the Tolex)

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And inside on the bench

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Doesnt look too intimidating but it just occurred to me that TDA 2040 or whatever it is may eliminate quite a few components

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Maybe this is the bridge rectifier

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That white cable is some type of three wire cable I just attached for makeshift speaker wire

Also I see an 8 DIP wondering what that is but all good in the hood because I get to find out 
EDIT: They are two 4558DD

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They must be for the cheese that goes CRUNCH

As far as the signal path well at least I think it begins at the input jack and ends at the speaker 

[saturated]

There is a switched potentiometer (or whatever you call a dial that turns on and off  ) for the overdrive gain

I thought maybe I could check the + and - voltage of each 4558DD with the gain off and on

But I got the same reading with it off or on it appears they are powered up at all times 

Then I checked the rectifier diodes and looks like we have a bipolar power supply 

Whose voltages show up on the TDA

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I think I may look at these diodes I'm curious I always think these clear colored diodes are zeners but sometimes they are (switching?) diodes idk

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But looking at the schematic for the 10xl and 15xl kindly provided by G1 they look like ordinary diodes

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So might be time for a look at the TDA and see why it needs diodes around it 

Seems like this is gonna be a good project I thank you for your help 

These integrated circuits op amps chips etc must be revolutionary because it occurred to me there is not one transistor in this amp 

[Jazz P Bass]

My take on the diodes is that are "clipping diodes".
A poor way of creating distortion.