This listing is for one MKS / Philips 53-S23B-128 127.728MHz 25kW Pulsed 1.5T MRI RF Power Amplifier. Amplifier was recently removed from service in custom R&D application. Overall in good condition, with some scuffs to the chassis from being moved around. The original Eimac tubes (YC-179) are installed and appear to be in good condition. Please note, the black box on top of the amp doesn't go with it and isn't included. Due to the power requirements and lack of a large enough load to safely run this, we have not tested it in-house. We will however guarantee it to be in functional condition once properly installed and set up. Please make sure this works for your needs before purchase. Please inquire for a freight quote if needed. Quote shown is just an estimate.