In 2008 Gauge Precision Instruments introduces the ECM-87, their first cardioid condenser microphone. Most MEMS microphones are variants of the condenser microphone design. On stage he mixes the pickup-signal with the input of a good condenser microphone. Some preamp-DIs provide phantom power, in case this is required to power a condenser microphone. Neumann is a large-diaphragm condenser microphone. Some famous models include the Blue Yeti USB microphone and the Snowball iCE condenser microphone. To amplify his instrument, Burke uses an MBC-603 condenser microphone on a stand. The C1000 is a cardioid/hypercardioid condenser microphone produced by AKG Acoustics. The U47 was the first condenser microphone switchable between cardioid and omni-directional pick-up patterns. Three years later the first condenser microphone was introduced, from General Electric and Neumann. The company's original product was the CMV 3, the world's first commercially available condenser microphone. The U-47 was the first condenser microphone that could switch between omnidirectional and cardioid patterns. A valve microphone is a condenser microphone that uses a vacuum tube (valve) amplifier.