The AR-51 provides a smooth mid-range, open top end, and solid, well-balanced low frequency

  • About This Mic
  • Specifications
  • Photography
  • Who's Using This Mic
  • Accessories

The R-F-T AR-51 is a high quality tube condenser that draws inspiration from the classic C12 and ELA M 251E microphones. It provides a smooth mid-range, open top end, and solid, well-balanced low frequency translation.

TELEFUNKEN Elektroakustik is well known for the historic recreation microphones found in the Diamond Series, which are meticulously made to historic detail with no expense spared. As such, these microphones become rather expensive for the average small studio or home enthusiast. With this in mind, the R-F-T Series of microphones was created.

The R-F-T Series of tube condenser microphones utilizes American designed electronics in conjunction with New Old Stock (NOS) vacuum tubes and standardized parts from overseas manufacturers. Just like the Diamond Series, all R-F-T Series microphones are hand-built in TELEFUNKEN Elektroakustik's South Windsor, Connecticut facility. With this line, TELEFUNKEN Elektroakustik is able to provide a lower cost alternative to more expensive microphone systems, without sacrificing the qualities that would be expected from a TELEFUNKEN Elektroakustik microphone.

The AR-51 features the amplifier electronics of a C12 and ELA M 251E and pairs them with a dual sided large diaphragm TK51D capsule. At the core of the R-F-T AR-51 amplifier is a NOS ECC81 / 12AT7 vacuum tube, which is coupled with the same German built Haufe T14/1 output transformer found in the C12 and ELA M 251E.

As of October 2012's Audio Engineering Society conference, the AR-51 and AR-70 STEREO microphone now include the TK51D capsule, a 34mm dual-membrane, edge-terminated design. This larger surface area provides an extended low end and a smoother, more open high end in comparison to the original TK67D. The implementation of this new capsule brings the AR-51 and AR-70 STEREO sonically closer to the ELA M 251E and C12 that employ the legendary edge-terminated CK12 capsule.

In use, the AR-51 is a fantastic utility microphone. Its smooth mid-range, open top end, and solid, well-balanced low frequency translation make it a great choice on anything from vocals to drums and percussion to acoustic guitar to saxophone.

The remote pattern selector, located on the power supply, provides 9 different polar patterns, giving the user a myriad of choices for how to record the source sound in a manner that will best complement their production.

Each AR-51 microphone comes complete with M901 power supply, M801 25' dual-shielded TX-7 tube microphone cable, M701 elastic shock mount and wooden microphone box.


Compare this mic with other TELEFUNKEN Elektroakustik mics.

To purchase a TELEFUNKEN AR-51 contact one of our resellers.

Reviews / Press

Music Tech Magazine AR-51 Review
Sonic Scoop Review: Telefunken R-F-T AR-51 Microphone: Tracking singer/songwriter Seth Abrams and band, Zach McNees tests out a pair of Telefunken AR-51s on drums, acoustic guitar, cello and vocals. Find out how they did!

TELEFUNKEN Factory Service - TELEFUNKEN offers restoration services for all TELEFUNKEN microphones. We do not sell any internal microphone housings or capsules without factory service performed in-house. Call TELEFUNKEN Elektroakustik for a return authorization number and to discuss work needed on your microphone system.

Please call 860-882-5919 for more information.

TypePressure Gradient Condenser
CapsuleTK51D - 26.5 mm Edge Terminated Diaphragm
Frequency Range20 Hz - 20 kHz, ± 3 dB
Polar Pattern9-Pattern Variable including Omnidirectional, Cardioid, and Bidirectional
Sensitivity13 mV/Pa, ± 1 dB
THD at 1kHz at 1Pa< 0.2%
Output Impedance250 Ω
Maximum SPL128dB
Non Linear DistortionLess than or equal to 0.5% at 100 dyne / cm sq
Self Noise (Amplifier) 8 dBA
Tube TypeGE ECC81 (NOS)
Power SupplyM 901 PSU - 7 Pin Female XLR Input, 3 Pin Male XLR Output, Polar Pattern Selector
Size240 mm L x 46 mm Dia.
Weight769 g
Supply Current<1mA (120V) 140mA (6V)
Supplied AccessoriesPower supply, wooden mic box, clasping shock mount, 25' Accusound dual-shielded cable, cardboard case
Optional AccessoriesFC01 R-F-T Series Flight Case




Accessories for the  AR-51  include:

M 901S

Dual Power Supply for (2) AK-47 MkII, AR-51 or M16 MkII with (2) Polar Pattern Switches


M 901

Power Supply for AK-47 MkII, AR-51 or M16 MkII with Polar Pattern Switch



R-F-T series flight case fits AR-51, AK-47, ELA M 260, CU-29



Microphone Wooden Box with Diamond Logo for AK-47 MkII, AR-51, M16 MkII


M 701

Clamping Shockmount for AK-47 MkII, AR-51 or AR-70 [41 mm Dia. Microphone Body]


M 801

25' Accusound TX-7 Dual-Shielded Cable with Neutrik 7-Pin XLR Connectors for all R-F-T Series Microphones



Combination locking flight case fits C12 & R-F-T STEREO SETS


M 901A

Power Supply Upgrade for AK-47 MkII, AR-51, or M16 MkII



Replacement head grill for the AR-51 microphone, finished in Black Chrome / Tri-Chrome.


National 12AT7WA

National rebranded tubes, mainly from the Mullard and Raytheon factories. The "WA" designation means that this VHF [Very High Frequency] dual triode is a select version that is deemed acceptable for military applications.



Hard shell flight case for the AR-51, AK-47mkII and M16mkII tube microphone systems. Virtually indestructible, TELEFUNKEN Elektroakustik's new rugged hard case has innovative features for unmatched strength and durability. It is o-ring sealed and waterproof up to a depth of 3 feet. It's airtight, and built to withstand the most extreme conditions. These cases are great for airline travel with an automatic pressure equalization valve. They include spring release latches lock in place as well as lock holders which are great for use with pad locks for added security. Inside the cases customized foam offers an extremely tailored, custom fit for the CU-29 microphone system.



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