I can confirm what Bob wrote. >From my log, these are the Lamp V of my 9 working LPROs: 8.25 5.18 7.74 6.54 6.5 7 6 6.5 7 The one that gives 5.18V seems to have some problem with the capacitive trimmer near the lamp. Antonio I8IOV Bob wrote: > >6.0 to 7.0 volts is a *very* typical lamp voltage on an early LPRO. >