Help with mods

[Khron]

I suppose, if you really want...

 

[ccaudle]

So LED 5 & 6 are the clippers then?

I would consider LED 2 and 3 to be a form of clipper as well, or at least a distortion circuit. If you suddenly decrease the gain when a signal crosses a voltage threshold that will result in a characteristic flat-top look to a waveform. I guess we could debate the fine points of whether that is a "clipper" or some other type of distortion, but that doesn't really seem like a useful distinction to me. The point is that the two op-amp circuits have different distortion characteristics, so you need to decide if you like and want to keep either, or if you just want the op-amps to provide clean gain and let the triode provide all the distortion character.

 

[Khron]

I could be wrong, but i've read / heard that the diodes in the feedback loop of an opamp lead to a more "soft" clipping, while the antiparallel ones to ground lead to a more "hard" clipping of the waveform.

https://www.electrosmash.com/tube-screamer-analysis#diodeshttps://www.electrosmash.com/proco-rat#link34

 

[musipol]

Those two different configurations do sound different. IMO even the diodes in opamp fb loop sound rather unconvincing by themselves. Combined with some tube clipping........now thats a different story. The anti parallel diodes to gnd can be softened up by including a resistor.........of course as you keep increasing level the opamp driving them will clip hard at some point. The filtering after the clipping is a bigger factor IMO. The raw output of either config mentioned above blows, IMO.

 

[Amled87]

Well, thanks for all your help guys. I was able to do a few little mods here and there and got something that I think is alot better then stock. It's still nothing more then a practice amp (I use my DSL 40C mainly)..

But, again thank you for the help!