Mark - Option 001 for the HP-5803B GPSDO featured a 12-character (alphanumeric) Vacuum Fluorescent Display (VFD). It appears to have been a custom VFD for HP / Agilent (Colons used in time display). http://www.leapsecond.com/museum/hp58503a/097-58503-13-iss-1.pdf
Noritake Itron Corp. (Ise Electronics Corp.) of Japan invented the VFD technology in 1967. Noritake, Newhaven, Futaba, Samsung, and a Chinese mfg. are the 5 major mfg. Three of these companies have their North American HQ offices here in Chicago area. Futaba in Schaumburg http://www.futaba.co.jp/en/display/vfd/lineup.html Noritake Itron Company in Arlington Heights https://www.noritake-elec.com/ Newhaven Display in Elgin Company is more of an East Asian importer, but handles custom runs. http://www.newhavendisplay.com/vfd-c-586.html VFD do have a finite life, and darken as they age. Samsung states 30,000 hours to reach it 80% level (brightness). You stated your unit has 83,000 hours. DOUBLE CHECK DC Power and electrolytic capacitors associated with circuit, this has been known issue with commercial consumer appliances with VFD. The mfg. date on your unit may have been during "bad caps" decade. greg w9gb == > I recently got in an HP-58503B GPSDO from a local equipment liquidation > auction. > The unit has 83,000 hours of run time. I think it was last powered up in > 2013. > > The display (VFD) is a bit dim and blotchy. > Does anybody have a replacement display that would look better? > - Mark -- Sent from iPad Air _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
