The AR-70 Stereo Tube Condenser Microphone with Case from Telefunken features a matched pair of 34mm diaphragm dual-membrane TK51D capsules, a NOS ECC81 vacuum tube, and a matched pair of European made custom wound T14/1 output transformers.

The AR-70 includes one fixed cardioid capsule on the bottom, and on top, a capsule wired for remote multi-polar pattern capabilities. This allows the mic to perform multiple stereo recording techniques, as well as a standard single-channel monophonic recording. In stereo mode, the AR-70 can be set up in standard X/Y configuration, with each capsule orientated 90 degrees from one another. The mic can also be utilized in Mid-Side (M/S) technique, where the lower capsule is fixed in cardioid, and the upper capsule is rotated 90 degrees and set to the Figure 8 pick-up pattern. The AR-70 can even be used in "dual mono" mode, which opens up a realm of creative potential.

The AR-70 microphone includes a flight case, custom 7-pin cable, wooden mic box, and a power supply with remote polar pattern selector.