![]() ![]() It rounds the sound a lot, and it kills lots of clarity. This cap acts as a low-pass filter on the final stage. This is super easy and very straightforward. Add a 1/4 jack to allow connection to a CAB. When you engage the boost, the amp still went loud fast, but you got some more volume resolution than before. The difference was more evident without the boost on. The original mod was to change the linear volume pot P4 to one with an audio taper. This change is rather obsolete now that we know that the last stage can be changed into a buffer without affecting the tone negatively. Removing C12 also removes a lowpass filter that kept the amp muffled (as described below). You might feel like you are not getting enough speed for how much you punch the gas pedal, but the top volume is still there and with a powerful pickup you can still get full volume if you need it. This results in a much more manageable volume. I removed R15, R16, R17, C12 and C13, and then bridged R15 and R17 so that pins 1 and 2 of the opamp are connected. Post 8 describes the effect and changed parts/values Change the tonestack to match the voicing of classic VOX circuits. ![]() The only issue with it is that when the boost is on and the gain is set high, the amp is VERY loud. Just snip the LEDs and you immediately get rid of that "bees in a can" sound when the boost is on. This is the first mod that anyone should do. Ssguitar and tdpri forums have much useful info. So here is the list of my TODO stuff, gathering info from around the internet, plus results so far. My goal is to have a nice super-clean platform to use with my pedals. The schematic has been around for almost a decade, but there still might be things that need to be fixed. It's easy to lift pads if you are not careful. Keep in mind that the pcb is crappy though. Plus it's a DIYer's dream, being a full old-school circuit with a transformer PSU and all through-hole parts. With a few mods and a cab it sounds very nice. That's my second ongoing small guitar amp project after the Fender Champion 40. ![]()
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