We have been testing and using the VF14M and AC701 tube replacements in our mics for a year now and have had very positive feedback from our customers. These tubes are super quiet when compared with original VF14ís and AC701ís and the tonal response is very accurate. RMS Audioworks
Phædrus Audio Electronic TubesTM are designed as drop-in replacements for scarce and expensive tubes used in famous, vintage microphones including: The Neumann U47, U48, KM54, KM56, M249, M269, M367, M49, M50, SM69, M269c, Schoeps M211b, M222, SONY C-220A, C-107, C-57, C-17B and others.
The electronic tubes are designed so as to not require any modification to these valuable microphones. See below for a short video, further information, applications and technical information.
Seven models of Phædrus Audio Electronic TubesTM are currently available.
The Phædrus Audio EF14M Gold Dot SUPERTUBESTM
The Phædrus Audio AC701k NEW! NEC 6D-H3 triode
Address all mail to firstname.lastname@example.org