EF14M replacement tube

The Phædrus Audio EF14M is a drop-in replacement for the EF14 and EF12 as, even these low-voltage heater tubes are now becoming scarce.


The EF14M is a Phædrus Audio Electronic tubeTM: a modern emulation of every aspect of the original thermionic device. The technology is described here.

The Telefunken EF14/ EF12 tubes have long been favourites for substitution for the VF14 device in mod's, clones and copies of the famous U47/U48 microphones. Sadly, even these low-voltage heater devices are now becoming rare; at least, those with sufficient performance for use as a microphone impedance converter.

The Phædrus Audio EF14M is designed as a drop-in replacement for the EF14 (or EF12) in U47/48 type circuits.

Click for the datasheet for the EF14M.

The Phædrus Audio EF14M is available in a standard and Red Dot version.


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