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The Boss SD-1 entered production in 1981 and is still being made today. It's essentially an Ibanez Tubescreamer circuit with asymmetrical clipping - making it slightly more dynamic and more amp-like in response. It's also more aggressive sounding than a TS and has more gain on tap.
Like the TS, the clean tone is mixed in with the overdriven signal - sitting on top of the fluffy overdrive giving the pedal good note definition. This, along with the mid-humped EQ means these pedals work great as boosters into an overdriving amp or pedal - pushing the mids into compression and shelving off a lot of low end. Just be careful not to crank the SD-1 too much into another gain stage, as the notorious whine of these pedals will come to haunt you...!
You can pick the SD-1 up for very little on eBay, so give one a try if you're after a Tubescreamer with a little more attitude!
Guitar is a Fender Strat through a Hughes & Kettner Puretone, recorded with a simple SM57 and an sE Electronics RNR1 Ribbon.
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