Good morning Elena,
Although the RIAC does not have data on the specific part that you mention, our Nonelectronic Parts Reliability Databook (NPRD) does contain failure rate information on “Electron Tube, Surge” device types. There are three summarized data records, all from Ground Benign environments and Commercial Part Quality, that total approximately 440 million hours of field experience with 4 failures, for a failure rate of 0.0091 failures per million operating hours, or 9.1 FITS.
