The R-F-T Series was developed to utilize elements of vintage designs and implement them in newly developed circuits. These microphones benefit from being able to draw inspiration from classic microphone designs, and having the freedom to tweak and modify them to suit design goals as needed without requiring historic accuracy. In order to offer microphones at a lower price point than the Diamond Series microphones, the R-F-T Series takes advantage of standardized metalwork from overseas as opposed to the Diamond Series' faithful dedication to historic construction. But don't be mistaken; the R-F-T microphones are 100% hand assembled from the ground up in CT, USA with the exact same level of attention to quality and performance as the Diamond Series.
The R-F-T line features all new old stock [NOS] vacuum tubes from manufacturers such as Telefunken GmbH, R-F-T, Raytheon, General Electric and Philips. These tubes are cleaned, burned-in, and tested for noise and microphonics prior to installation. The AR-51 and AR-70 utilizes the same Swiss-made Haufe T14/1 output transformer as in the ELA M 251 series and C12, while the AK-47 MkII uses a BV8 output transformer built to the original specifications as in the BV8 used in the U47. The CU-29 features a Lundahl LL1935 output transformer, which was selected as being the best sonic and electronic match to the 6AK5W-based amplifier circuit. The ELA M 260 microphones feature a custom American-made output transformer wound to match the output impedance of the amplifier circuit. All R-F-T capsules are individually tested in an anechoic chamber for proper frequency response and gain prior to installation into a microphone.
The R-F-T Series differentiates itself in its use of premium circuit boards for build efficiency, but these are no ordinary circuit boards. Instead of the modern day, mass produced boards with surface mount components and tiny traces, TELEFUNKEN has opted for hand plugging and soldering each board one at a time to ensure consistent quality. These circuit boards are precisely laid out with careful attention paid on directness and length of traces (especially for high-impedance lines) and maximum trace width for optimal current flow, which in turn closely emulates point-to-point wiring.