The Peiker PM 23, also known as Peiker Kristall-Mikrofon 23, is a German piezo crystal mic which looks like Linzer Torte, the famous Austrian cake, and which came in quite some different paints – there was a gold-coloured version as well as a silver one, and there was a Stenotape mic, built by Peiker for the eponymous American tape recorder company owned by Geloso, which was a light shade of green and which Bert van Oortmarsen has featured on his site on European microphones from the past. He also poses the question why Peiker made that mic, not Geloso – I guess the answer is that it was merely one of a series of different Stenotape mics, as can be seen on this Russian tape recorder website about the Stenotape.
It was built in the 1950s, and one of its versions had an Amphenol-1-Pin connector. This curious connector was used for many hi-z crystal PA mics on a gooseneck mount or in military applications and surprisingly still sees regular action. As those old piezo crystal mics have been repurposed as harp mics, and the Amphenol 1-Pin matches many of those old Shure bullets, salt shakers and what have you, it is still a regular for harmonica mics. There was also a custom connector with four flat pins which catered to the Geloso Stenotape recording devices, as seen in the article linked above. Some versions featured a heavy metal table stand.
- Polar pattern: omni
- Frequency range: 30-10000 Hz
- Sensitivity: 5,5 mV/µb.