The Telefunken Elekrokustik M 803 is a tube microphone cable with 7-pin XLR connectors compatible with the following Telefunken microphones
Alchemy, R-F-T and ELA M 260
(TF29, TF39, TF47, TF51, AK-47 MkII, AR-51, AR-70, CU-29, ELA M 260, M16 MkII).