Check the listing for details. Warm Audio WA73 1 Channel British Mic Pre Refurbished. Condition: Excellent - Refurbished. Listed at 527.12 USD. If there’s one style of preamp that professional engineers would unanimously agree has defined the tone of pop/rock records for decades, it would most definitely be the venerable '73-style of mic pre. '73-style preamps have been used widely in recording and live applications for many years, and are still considered to be a holy grail of preamp choices today. The Warm Audio WA73 Family consists of single- and dual-channel '73-style preamps (with & without EQ), that each pay careful homage to British audio history. After years of R&D, careful reverse-engineering, and countless hours of auditioning, the WA73 is born. The WA73 is a “desert island” boutique preamp, but it can also be classified as a studio and live workhorse.