Tube Condenser Microphone with JJ Slovak 5751 tube. The WA-47 is an all vacuum tube, large diaphragm, transformer balanced, multi-pattern (9), large condenser microphone, based on the classic ‘47 that has been used on countless hit records for the last 50+ years. The WA-47 is designed for pro studio, home studio, live, and broadcast applications and sounds great on vocals, acoustic/electric guitars, acoustic/electric bass, drums, piano, strings, brass/woodwind instruments, and an array of other sources. The classic ‘47 became extremely popular in the 1960’s and is now considered one of the greatest microphones ever made. Self-noise: 11 Dba. Dynamic range: 130 Dba. Maximum SPL: 140 Db (<0.5% THD). Frequency range: 20 HZ ~ 20 KHZ. Output impedance: 200 Ohm. Rated load impedance: ≥2 K Ohm. S/N ratio: 82 Dba. Equivalent noise: 10 Dba. Weight: 4 kg. Mic diameter: 90 mm. Mic length: 254 mm. Includes: microphone, wood box, power supply unit, shockmount, Gotham 7 pin GAC-7 cable, IEC power cable