Re: Copper Sustain Block from FloydRoseUpgrades
I've got one on an 89 Kramer equipped with an OFR. Alder body, maple neck, scalloped rosewood fretboard, Duncan JB bridge & 59er neck...
Sounds fantastic. Warmer than brass, but with scooped mids. Highs are also crystal clear. Not as muddy of a warmth as some brass blocks can be, this is a tighter bass response. Screaming harmonics. I have had it for about a year, with no trem cavity cover, and I do not have any corrosion whatsoever. I use this guitar primarily for 80's style hard rock/ classic metal covers (Ozzy, Maiden, Priest, AC/DC, Crue, Scorps, Ratt, etc etc). For this application it sounds great! If you want that more mid-strong Vai tone this block might be counter productive. But if you want ball crushing low end crunch w/ simultaneous screaming highs this block is the ticket.
Never tried Cu on a Jem though... My Jems all have stock blocks except for one which has a brass block. This is due to aftermarket blocks being bigger dimensionally & compromising trem range of motion & is something to keep in mind for non OFR applications. I am currently having a Tungsten block custom made in the exact dimensions of the stock block for one of my Jems though (Edge Pro trem) so i'll report back how that one sounds soon.