ShortScale.org

Long and short of it is, the Trew Grit is pretty good, but the frequency the treble control boosts is too high for my tastes, making the tone kinda fizzy or dull, no real happy medium on the pot. I THINK the boost mode also raises the top end a bit, making setting up 2 usable sounds with the shared bass/Grit(subtle upper mid control)/treble EQ pretty damn impossible.

To change the frequency value, is it as simple as a resistor change? Or would that just change how much boost is available on the pot? Is it a cap change? Something more involved? I can't find a schematic for it anywhere.

Cap change would be the way forward, definitely mate. You can easily change the frequency range of a Treble or Bass control. We'd need a schematic or some really good pictures of the the board (front and back) and all wiring to figure it out though.

But generally the resistor and cap values around the treble control will be setting the break frequency at which it operates.

Just looked through all the pages at FreeStompBoxes.org and couldn't find any schematics/posts on the Zinky True Grit unfortunately.

In other news, so going to use that site to try out cloning some simple pedals like the Super Hard-On for my own amusement.

Mike wrote:Cap change would be the way forward, definitely mate. You can easily change the frequency range of a Treble or Bass control. We'd need a schematic or some really good pictures of the the board (front and back) and all wiring to figure it out though.

But generally the resistor and cap values around the treble control will be setting the break frequency at which it operates.

Ok cool, I'll try to take some snaps. Tried to take it apart last night, but the bastard has used tons of hotglue to meld the output jacks to the top of the control PCB. Luckily, there's a fair bit of space between jacks and the board, so I should be able to get em apart with a knife and a bit of caution.

It's a shame, because the non boosted mode sounds really nice and full- there's a lot of scope on the bass control, the Grit control can slightly mellow the tone a little, and the overall brightness is pretty good when the gain isn't too high. I think the high end increases with the gain- the boosted mode basically "turns up" the gain control by like half, and seems to add brightness to the proceedings. I'd be happy if I could just take whatevers making it brighter in the boosted mode.

Doog wrote:I think the high end increases with the gain- the boosted mode basically "turns up" the gain control by like half, and seems to add brightness to the proceedings. I'd be happy if I could just take whatevers making it brighter in the boosted mode.

Interesting. if you want to get rid of this effect we can just add a Bright Cap to the Gain knob.

It's odd, because the non-boosted mode at full gain sounds pretty much exactly the same as the boost mode with the gain at 1/3 or so, suggesting it's just the more gain, the more TREBZ.

But, the boost mode adds some hiss, regardless of where the gain dial is set, even all the way down.. which suggests to me that there's some kind of high end boost being applied post-gain? Or just some crappy designing?

Maybe the latter? Weird.

I have Box of Rock, SHO and Fulltone OCD schematics. Noice.