TELEFUNKEN CU-29 "Copperhead"

TELEFUNKEN CU-29 "Copperhead"

The CU-29 'Copperhead' offers a warm, well-rounded low end accented by a delicate and intimate 'air' in the high end. The clarity and detail are unsurpassed by any other microphones near its surprisingly low price range.

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

The R-F-T CU-29 "Copperhead" offers a warm, well-rounded low end accented by a delicate and intimate air in the high end. The clarity and detail are unsurpassed by any other microphones near its surprisingly low price range.

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 CU-29 "Copperhead" was developed from the ground up in our South Windsor, Connecticut facility by TELEFUNKEN Elektroakustik's in-house design team, along with the aid of some of the industry's most knowledgeable and respected consultants. Specific attention was given to circuit board layout, with countless revisions done to optimize current flow and directness of traces. Each component was experimented with and individually selected for the best sonic and electronic qualities. Extra consideration was put on keeping high impedance lines as short as possible to maximize efficiency and minimize unwanted noise. Lastly, a wide array of output transformers was experimented with to provide the most open and sonically pleasing response.

This fine-tuned amplifier design found in the CU-29 "Copperhead" features a NOS TELEFUNKEN 6AK5W vacuum tube and a Lundahl LL1935 output transformer. Being a cardioid only microphone, the R-F-T CU-29 "Copperhead" employs a single-membrane version of the TK67 large diaphragm capsule used in the AK-47 MkII microphone, which undergoes rigorous testing in our laboratory prior to installation.

Sonically, the CU-29 "Copperhead" is a remarkably hi-fidelity microphone that provides a warm, clear low end complemented by a smooth, detailed high end. The CU-29 "Copperhead" is an excellent multi-purpose microphone that sounds great on drums, electric guitar, vocals, bass, piano and a countless number of other applications.

Each CU-29 microphone comes complete with M900 power supply, M800 25' tube microphone cable, M700 elastic shock mount and wooden microphone box.


Please contact your favorite TELEFUNKEN Elektroakustik reseller to demo or purchase the TELEFUNKEN CU-29 "Copperhead". For reseller referrals, please feel free to email:

Reviews / Press

Music Tech Magazine CU-29 Review

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
CapsuleTK67S - 25.4 mm Center Terminated Diaphragm
Tube TypeGE JAN 5654W (NOS)
TransformerLundahl LL1935
Polar PatternCardioid
Frequency Range20 Hz - 20 kHz, ± 2 dB
Sensitivity19.5 mV/Pa ± 1 dB
THD at 1kHz at 1Pa (Amplifier)<0.3%
Output Impedance19.5 mV/Pa ± 1 dB
Maximum SPL (for 1% THD)130 dB
S/N Ratio87 dBA
Self Noise (Amplifier)7 dBA
Dimensions / Size200 mm L x 46 mm Dia.
Weight640 g
Current Draw from Mains50 mA
Power SupplyM 900 PSU - 7 Pin Female XLR Input, 3 Pin Male XLR Output
CableM 800 - 25 ft Cable, 7 Pin Male & Female XLRs
ShockmountM 700 - Threaded Base Elastic Mount
Wooden BoxWB00
Flight CaseHC00 - Hard Shell Protective Case (not included), FC10S for Stereo Set

Compare this mic with other TELEFUNKEN Elektroakustik mics.

Download the PDF CU-29-Cutsheet





Accessories for the  CU-29 "Copperhead"  include:

M 960S

Dual Power Supply for (2) ELA M 260 or CU-29


M 900

Power Supply for CU-29



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



Microphone Wooden Box with Diamond Logo for CU-29


M 700

Base Threaded Shockmount for CU-29


M 963

3 Channel Power Supply for ELA M 260 / CU-29


M 801

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



Replacement head grill for the CU-29 Copperhead microphone, finished in antique copper plating.


GE 5654W

GE 5654W replacement vacuum tube for use in the TELEFUNKEN CU-29 microphones



Hard shell flight case for the CU-29 Copperhead tube microphone system. 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.


TELEFUNKEN CU-29 "Copperhead"

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