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.
Four models of Phædrus Audio Electronic TubesTM are currently available. We also have a selected stock of EF14s for U47/48 microphones or clones modified to use this 6V heater tube.
The Phædrus Audio AC701k NEW! NEC 6D-H3 triode
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