TK61 Omni Capsule The TELEFUNKEN TK61 is a small diaphragm omnidirectional capsule used with the ELA M 260 tube microphone and the M60 FET microphone. Featuring a 6-micron gold-sputtered membrane measuring 15mm in diameter, the TK61 offers a large, open sound perfect for capturing the subtle nuances and space of your recording environment. The frequency response is flat from 20 Hz to 5 kHz, with a smooth, airy presence peak at 8 kHz. These small diaphragm capsules are tested to a strict ±1dB sensitivity tolerance. When used with the diffuse field spheres in the ELA M 260 Tri-Mono system, the TK61 omnidirectional capsule captures the ambience and vibe of your room to breathe life into any recording.