When G1 said that I was like oh hell yeah of course it does 

Then later on I was "hmm I wonder what that means in English?"   

So I looked at the data sheet and found this but I think this is something different

Furthermore, the device incorporates an original
(and patented) short-circuit protection system
comprising an arrangement for automatically
limiting the dissipated power so as to keep the
operating point of the output transistors within
their safe operating range.

So I said well just make a diagram and try to figure it out so here goes 



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Hope I didn't get it backwards my mind gets turned around trying to figure out those diodes

If someone could compare those two schemstics, I'd be really thankful, since all I know about this stuff is that electricity comes from kites.

Thanks for the clarification G1.

The diodes D6 and D7 are for 'protection against output voltage spikes' and are included in the datasheet circuit (attached).
If the output swings more than approx. 0.7V above or below the supply rails, they conduct and clamp the output to the rail voltage.
D8 and D9 on 10XL schematic appear to be clipping diodes that are switchable for whatever "SCG" stands for.

If you want more amplitude before clipping, add more diodes in series. 
Also, try just clipping the top alone (or bottom), which is what you might find in some tube amp stages.  We don't always get a nice symmetrical waveform, nor do we always want it.

Quote from: Chorch Cluni on August 25, 2026, 04:21:20 PMWhat would that mean (being EC1912 drawings)?.

Nothing in particular.  Just that some of the schematics give the PR model number on them, this one doesn't.  Now we know that PR241 = EC1912 circuit.

For the original question in your first post, we can compare the EC1912 schematic to the PR495 schematic that dmeek posted.

I was reading about this today and became very interested in it.  Some old posts one of the big dogs here was fussing about fender saying they don't know how to make distortion all they do is diode clipping.  So I immediately took notice and said hey I definitely want to check this out  Also it's right there with the other stuff I have been doing 

So I was at work and I wanted to know how to make a sin wave with the points chopped off like a sin wave with flat peaks

I always have old books at work to look at and of course I easily could have looked it up online....but I said why don't you try to come up with something based on what you have been doing and learning 

And honestly I didn't have much

About the best I could do was maybe use zener diodes in parallel maybe but I figured there was a way using ordinary diodes

I also figured it would help to get some capacitors involved but honestly my head is still spinning from trying to grasp all that they do 

So I thought about the diode limiter experiment I did and thought well you just need some voltage remaining so you'll have some peaks and then maybe have the diodes in parallel so I get the positive and negative and yes I was pretty much guessing like well I'll build it and see what happens

So I got off work and had to go mow and pick up two bags of pine needles  got back and even before showering thought dude just try it so guess what

Input

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And output

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And yeah it's pretty ugly I wanted some nice peaks with the tips cut flat.

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I think the resistors are 10k maybe I can try different values but I think it actually works   

But idk here are the two channels together

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Yes sir thanks that's cool that you mentioned that
I did a search here about 4558 and read quite a bit including one of your experiences 

Then some members were discussing diode clipping I got pretty excited wanting to experiment with those type circuits 

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

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