A pair of Amperex, made in France 3-500Z/8802 tubes. I ran them for a few weeks in my B&W PT2500 amplifier. I removed them about 6 months ago. Just tested each of them in my Ameritorn AL80A and they work perfectly! They put out more power than a new Eimac 3 500. $475.00 for the pair plus shipping by FedEx Ground. 73 and thanks! Jim W7RY