Re: Marshall Speaker Reactance Emulator

Posted by induction on Jun 06, 2016; 9:48pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/Marshall-Speaker-Reactance-Emulator-tp31283p31305.html

Sergio wrote

Lots of information! Thank you again, Induction!  so the speaker saturation simulation its more or less like very soft od? In my research for more info about the circuit i found that it was referred to as some type of "tape saturation" instead of speaker , like the compression you get recording to reel. ThAnk you, as I said very useful.

Yes the SSS is just a soft OD. To me it sounds a little like a Timmy with no EQ options. It's nice as a stand-alone od, but I'm one who agrees that most overdrives sound very similar. I'll answer in more detail when I post the SSS, which I'll do next.

Tabbycat wrote

... what do you use for your dummy load? is that a build of your own design or adaptation? a decent dummy load build is still on my list, but i feel fairly incapable of sorting crap designs from good ones, re the diy options out there. and destroying my amp would be too high a price to pay for experimentation along these lines.

My dummy load is very similar to the Weber Load Line with a slightly more sophisticated tone control. (SWTC V3, though after implementing my reactance emulator, I keep the tone control on the lineout flat anyway.) I'll post the schematic and layout here if you like. Except for the tone control, no vero is necessary, it's just a power resistor in parallel with volume pot and series resistor. The trick is that you have to build the dummy load circuit specifically to suit the amp you want to use it with. The power resistor has to be able to handle twice the output wattage of the amplifier, and the lineout voltage divider has to give the appropriate range of output voltages. My amp is a tiny (1-4 Watt Class A), so it was very simple. If you want a dummy load for a 100 Marshall, you'll probably spend one or two hundred clams on power resistors alone.

can i also ask which diy cab sims you like most? have built (not tested) the rog condor which seems to be widely appreciated. alex has also done a multi cab sim in the layouts here which i might try. seemed to get approval at diysb, which is often a sign that it is what it claims to be.

http://tagboardeffects.blogspot.co.uk/2016/01/multicab-simulator.html

The Multicab is the only one I've built. I liked it on the breadboard, but I haven't tested my vero build yet, and I don't foresee much opportunity to use it. I built it as a backup, for the cases where I can't bring an amp and I have to plug into a stereo or a set of computer speakers or something. That used to happen a often enough, but I can't remember the last time I jammed with anyone, so building it was kind of like closing the barn door after the horse already escaped. For recording, I generally use impulses, not analog stuff. The Multicab would probably be useful for making a headphone amp, but I never play with headphones either.