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 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.

Three 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 VF14M and the The Phædrus Audio VF14T

The Phædrus Audio AC701k     Microphone grade EF14s

Phædrus Audio Electronic TubesTM are now available in two grades: a value grade - ideal for DIYers; and the Phædrus RED DOT Electronic TubeTM grade. Read more about RED DOT tubes here. Prices are here.

For more information on Phædrus Audio AC701 Electronic TubesTM contact


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