Anomalies in temperature dependences of attenuation and velocity of ultrasound have been found in ZnSe c1ystal made by the seeded physical vapor-transpo1i method in vacuum. The character of anomalies has been similar to ones observed in 3d impurity c1ystals in which the Jahn-Teller (IT) effect (JTE) [1] takes place. Our investigation has indicated the trigonal symmetiy of the local vibronic mode, meaning that the JT centers subject to T R e + t2 JTE problem. To detennine the impurity responsible for the anomalies, we have caITied out mass specti·oscopic investigation using an ELAN 9000 ICP-MS quadrnpole-based insti11ment (Perkin-Elmer SCIEX). It proved to be that detected 3d impurities that could lead to the JTE have much smaller concenti·ations to be studied in an ulti·asonic experiment. Therefore, we have considered vacancies V_Zn as the JT centers in this c1ystal. We have simulated the background attenuation ab = 0.0138xT 2 + 0.0126xT 4.