M 901S Dual Tube Microphone Power Supply (AK-47 MkII, AR-51, M16 MkII, TF39, TF47, TF51)

Dual power supply for two AK-47 MkII, AR-51, M16 MkII, TF39, TF47 or TF51 microphones with two 9-position polar pattern switches


Out of stock


TELEFUNKEN Elektroakustik’s premium power supplies feature the traditional styling of vintage Austrian models, partnered with the improvements of modern component technology and circuit board design. These modern improvements include a slow-ramping filament voltage to extend tube life and full regulation to ensure the microphone will always operate the same, regardless of line voltage variations or location. Full regulation also means that stereo power supplies can also safely power only one microphone at a time at correct operating voltages, if needed.

These units are hand-built in South Windsor, CT, USA with premium components including Signal Transformers, Nichicon capacitors, Neutrik connectors, double-thick circuit boards for structural integrity, and a PCB layout made to maximize current handling. They are built well over-spec to ensure reliability and safe operation for decades. Each power supply is calibrated to the specific microphone system it comes with. They are burned in as a full unit to ensure optimum performance and operation.

TELEFUNKEN Elektroakustik variable pattern power supplies feature nine polar patterns, from Omnidirectional to Figure 8. The polarizing component network is identical to that of the original AKG C12 power supplies, providing the optimal impedance and voltage to the capsule.

7-Pin XLR Pin-out:
1 – B+ (120VDC)
2 – Heater (6VDC)
3 – Polarizing (0-120VDC)
4 – Ground
5 – Audio (-)
6 – Audio (+)
7 – Ground


Please note this item is built to order.  An estimated ship date will be provided by our sales team.

Live From the Lab

TELEFUNKEN provides these multitrack audio files for the sole purpose of allowing individuals an opportunity to utilize them for home studio use and for educational purposes only.

No commercial use is permitted.  Any commercial use or reuse is strictly forbidden.

By downloading any track hereunder the user agrees to properly attribute all copyrights and to display the following on any non-commercial reuse of the video and multitrack audio files as follows:

All audio files have been engineered and recorded by TELEFUNKEN Elektroakustik and are presented for educational and demonstrational purposes only.

Live From the Lab

The LIVE FROM THE LAB live music video series is recorded and filmed at TELEFUNKEN Elektroakustik’s facility in South Windsor, CT. Each session is tracked live exclusively with TELEFUNKEN microphones and features unique performances from a variety of local, regional, national, and international artists and ensembles.

The multitrack audio files from these sessions are available for free download via clickable links below the individual performance videos. All audio files are presented in .WAV format and were recorded at 24bit / 48KHz sample rate. They are clearly labeled in the same format with the source listed first (LEAD VOX, ACOUSTIC, PIANO), followed by the microphone used (C12, AR-51, etc) and can be downloaded and imported into your Digital Audio Workstation of choice.

For more additional content please visit livefromthelab.net