On the typical marshall style amp with a choke between the 2 caps in the first cap can, where exactly is the difference in sound between a choke and a resistor heard? In other words, we all know that using a choke instead of a resistor give the amp a different feel if not a bit different tone. But my question is WHERE that difference the choke makes is happening. does it influence the amp's tone/feel in the preamp or PI at all, or only the PA? I ask because i want to impliment VVR in my amp, but i only want it to scale the PA. So in order that i don't affect the sound the preamp now has, i intend to use the same filtering that the preamp now sees without VVR. When i impliment VVR i will have to break the B+ connection after the screens and tap the B+ from the standby switch to go to the PI node. (yes, i'll use diodes to isolate) This way the PI and preamp are seeing the same B+ cap/R lineup as before EXCEPT for one thing....no choke. I will be using a resistor instead. I am not about to put a second choke in for more reasons than i care to explain.
So thats why i want to know. My amp now sounds so awesome i am afraid to do anything that may change it. heres my schematic that I just sloppily edited to reflect how i intend to do it. Notice that the preamp should see the same thing as before except for the R instead of choke. I'd also like to hear any comments on whether you think there will be any loss of interaction between the pre and power amps now that they don't share the same components even whenmi bypass the VVR by connecting the board's B+ in and out wires.
Choke question
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