TDA1771 is a monolithic integrated circuit used in the Vertical Deflection Circuit. SIP-10 Package. It is a full performance and very efficient vertical deflection circuit intended for direct drive of a TV picture tube in Color and B & W television as well as in Monitor and Data displays. This is used on Wells Gardner U5000, U2000, K7500, K7400 in location U601. NOTE: We bought a supplier out and they had a mix of NOS, refurbished / used ICs so you will get any of the types but we have 100% tested them all so you know no matter what you get they will work.