We have a large number of RF drivers available that are in need of repair or could be used for spare parts. Siemens part number 1964878 (Comtech PST p/n 31196/15M00107-01 or MPD p/n 34874-DB061470-2). Units have a varying range of problems: some have no output, unstable output, bad readout display, bad internal power supply, etc.
Please also see our listing for good working RF Drivers, here, and here.