Co-designed with famed tube-circuit designer Anthony DeMaria, the ADL 600 is our top-of-the-line tube mic preamplifier. Featuring a Class A, discrete design with three top-grade vacuum tubes per channel, it uses only top-shelf components and operates with ±300V power rails for maximum headroom and superb tone. The dual-transformer design also ensures low-noise operation, with maximum common-mode rejection. The result is an ultra-low-noise tube preamp with a big, warm, smooth, clear, distinctive sound. We believe it is the best tube mic preamplifier money can buy. When you hear it, we’re confident you’ll agree.