Recent content by Blackboarcult

Right, if I understand your question correctly... The way I see it (and I could definitely be wrong), they basically merged two different stages, a Multiple Feedback Filter, and a simple highpass inverting gain stage. Clever way of saving one half of an opamp by having both frequency manglings...

I'd bet me pinkie that it's simply to compensate for the fact that the whole preamp before it is lacking in lows and quite bright as is. As such, you'd need a nice, hefty bump at 100-120Hz, a scoop across all mid frequencies and just a gentle hump on the higher freqs to more closely resemble a...

On the top circuit: you are missing a resistor to ground at the positive input of the first opamp. Won't work well as is. Bottom circuit: as Scruffie said :D

Peavey Bandit silver stripe, clean channel, bright off. Going into a scavenged and gutted Fender frontman 2x12 open back cab, containing a G12T75 wannabe (EHX's sneaky copy of it) and a WHS greenback wannabe. Tone stack is similar to Bassman, which is to say halfway between a Marshall and DRRI...

Si quieres encontrar a alguien que te haga la faena, te va a salir más a cuenta postear en inglés, amigo... Con la de herramientas en línea que hay para traducir, no debería de suponerte mucho engorro ;)

EXTRA clipping/distortion. More harmonic complexity and compression, etc.

Technically you could mimic any amp with a plexi topology: laney supergroup, sunn model t, park, traynor yb-something to name a few. Careful spice modelling will be required, though.

Unless there's a vactrol in there. Then a lenghty debate about light exposure and the LDR's ISO ensues, and nuthin gets done.

Gotcha. I had never thought of this when toying with opamp clipping. Generally bigger feedback resistor = smaller caps which makes me oh so happy, but I'll have to take that into account also. I've had the same experience. When building one of those small SS marshalls from the 80's, I compared...

Nice! I had it on my list to tinker with this one. The 1458 opamp clips in a fairly pleasant way too. But how do you get asymmetrical with 4558's, given that Vref is at 1/2 of V? It shouldnt be too far from symmetrical as is, right?

This. OTAs are the devil incarnate. One minute they pass sound, the other dead silent. Check connections, rebuild, nope, nada, rien, null. Also, the (original) TS9 sitting on my shelf. I have disassembled it three times, voltages - check, solder points - check, transistors, check, plug in...

That's so freakin cool. Did you use actual 3280's for the clipping section?

There ya go https://github.com/kanengomibako/ReverseEngineering/blob/main/BOSS/BD2W/BOSS_BD2W_schematic.png

Ace!!!! 🤘🤘 It does feel like it's hitting a bit too hard at the beginning, but I actually quite like that sound. I'll have to breadboard it :D Would probably sound even better with a Rat or SD-1 goosing it up...

I have an original JCM800 pedal. It does a pretty good job at mimicking the real amp, down to its quirks (too much bass when gain on max, not really fit for palm mutes without a tight OD in front, slightly harsher treble than one would expect). I wouldnt compare it to the SL drive - it feels...