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We just got in our shipment of Pete Cornish TB-83 Treble Boosters. The TB-83 was a crucial element to Brian's sound and when used with the pickup selections on the Red Special, you can get a wide variety of tones.
You can call us at 415-957-9131 if you have more questions.
I also have the Morley George Lynch Tripler that has a boost knob so that you can split your signal three ways.
-- Jim
p.s. I'm going to have REALLY exciting news in the next few weeks regarding Brian May Guitars at Audio Images. Stay tuned.