The Audio-Technica AT8531 is the belt pack type replacement power module only for AT803b, AT831b, ATM73a, ATM75, U841A, U851A, U853Aw, U853AwU, and U857AWU. It runs on 1.5V AA battery & phantom power, with low frequency roll-off, input on TA3M, output on integral XLRM 3-pin. Furnished with U853, U857A Series, U841A, and U851A. |