includes yoke and attached cable terminating to XLR connector
good cosmetic condition, see photos
massively heavy, weighs almost 9 pounds!
perfect working condition
The Telefunken M201/1 was one of the very first commercial ribbon microphones. It was made around the early 1930s and would most likely have been used for radio broadcast. These ribbon mics were a big improvement on the carbon microphones that they replaced, but in Germany they were quickly superseded by the new valve condenser microphone technology.
There are very few of these left in circulation - this one is in very nice condition and sounds truly excellent, with a strong output not much below a modern dynamic. After over 80 years, the magnets are still strong with a field on >5000 Gauss in the narrow 2.5 mm gap between the ribbons.
The M201/1 is constructed around a huge horseshoe magnet, which surrounds the transformer and (presumably) some kind of acoustic labyrinth or wadding to control the pattern. This dictates the shape of the body and gives it an unusual cylindrical aspect. The ribbon sits behind a fine brass grill at the front of the mic. With the rear of the ribbon being obstructed by the magnet, the mic is almost cardioid in nature, becoming more figure of 8 towards the very bottom of the frequency range. Two chrome B-shaped vents sit above and below the ribbon to equalise the pressure behind the ribbon. The output connection is made via a pair of screw terminals hidden behind a circular plate on the rear of the mic.
Although we can't see the transformer, we can make some measurements. The primary and secondary DC resistances are 50 milliohms and 19 ohms respectively, and the inductances are 5.25mH and 2.43H at 100 Hz, which gives a turns ratio of (about) 1:22. The low DC resistance and relatively high inductance point to a well designed transformer with a good quality core and thick wire for the primary. Excessive resistance in the primary winding leads to noise, so it is especially important to see a low value here.
The ribbon itself is long and thin. The mic shows a strong output with good bass response, a little proximity effect below 100Hz, and a graceful roll-off above 6KHz.