The Upton 251 microphone is a condenser microphone
based on the classic Telefunken ELA M 251 which was produced by AKG from
around 1960 to 1965. The original 251 is widely regarded to be one of
the finest microphones ever made and is great for many recording
applications. The Upton 251 utilizes their own CK12 capsule, T14
transformer as well as the original circuit design.