Accumulated hours are as of 8 am local time on February 3rd, 2017.

Original front end diode box S/N OBS2-FE-DB.  This diode box has since been
refurbished.
18082 hours

Replacement front end diode box (this box was only swapped out due to a power supply failure)
This diode box still has diode current head room despite the large number of operating hours.
S/N DB-1207
18116 hours

Current front end diode box S/N SPARE3-FE-DB
5104 hours

The high power oscillator diode boxes, OBS2-DB1, OBS2-DB2, OBS2-DB3 and OBS2-DB4
have 15795, 15795, 15794, and 15794 hours respectively.