#1
Well, I've been using my Arteffects Zenith OD infront of my C30 to tighten up the gain and give it the roar that I like. I run the Focus knob at 3 o'clock, the gain cranked and pulled, the treble set flat, bass cranked, and the volume flat.

BUT, when I'm running my SG through it, Feedback is rampaging my sound. Should I get a noise-gate or should I sheild my SG and its 43 year old pickup?
#3
Try running the OD with the gain on zero and the volume full. That helped with my C30 getting feedback from my J&H OD
#4
IT's quite possible that the "43 year-old pickup" in your SG (I assume your SG is a '65, then? If so, pics please) is microphonic. The wax potting in pickups can break down and get loose after a while, causing the copper windings to vibrate. Assuming it was vaccuum potted at all, I'm not sure if they did that in 1965.

A new, modern, wax potted pickup would probably help, but you might want to invest in a new guitar at that point. I'm sure the '65 pickup sounds amazing, it's just not made for high-gain stuff like you're doing.
#5
^ Pickups can be rewaxed potted as well. I had the same issue with modern humbuckers and C30 when boosted, a noise gate mabe an option, or turn your amp volume down/get away from your amp.
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Johnbryant you are obviously a genius

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Custom USA Standard Telecaster
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#6
It sounds like a baddass, that p-90 roar is optimal for my primordial rock assault. It gives the heavy metal a different tone, grittier, angrier. I am however investing on either a Gibson or Hamer Explorer, or perhaps a Les Paul styled guitar (i'm thinking either saving up for a real gibson LP classic and modding it to john sykes specs, or getting an EC-1000 and doing something simaliar.)

Could any one link me to wax potting threads? also I'm a little clueless as to exactly what that does... I'm going to assume that it keeps the coils stable? Help?