Andrews Amplification’s Spectraverb 40 and Spectraverb 20 amps are U.S.-made and hand-wired on heavy-duty turret boards. Based on Fender’s AB763 circuit, it uses U.S.-made transformers, tube reverb with limiter control, external bias test points and adjustments, two 12AX7, two 12AT7 one GZ34 and two 6V6 (Spectraverb 20) or two 6L6GC (Spectraverb 40) tubes. Options include a series effects loop with true bypass, and a half-power switch. See more at www.andrewsamps.com.