DG10LI Vacuum Fluorescent Number Tube

valve, tube, thermionic, electron, triode, tetrode, pentode, power, magic eye, tuning indicator, nixie, history, data, data sheet, specification, amplifier, radio, octal, B9A, B7G, B4, IO, KT88, KT66, 12AX7, 12AY7, 12AT7, ECC81, ECC82, ECC83, 6L6, 6V6, EL34, EL84, EM34, EM80, EM81, EM85, Mullard, Cossor, GEC, Gold Lion, Marconi, Svetlana, Brimar, Ferranti, RCA, Sylvania, GE,6202, amperex, arcturus, brimar, channelmaster, colvern, cossor dario, debanks, edicron, ediswan, ei, elpico, emi emston, era, eratron, ever-ready, ferranti, ge, gec heinz, kaufman, haltron, hivac, hrs, itt, jackson lamba, lorenz, marconi, mazda, mullard, national, osram philips, rank, raphone, raytheon, rca, rft, selectron sovtek, standard, svetlana, sylvania, telefunken, tronix, tungsram united, valvo, westinghouse, zaerix

The last character of the type designator may be a '1' or an 'I'.

Vacuum fluorescent tubes are thermionic triodes with multiple phosphor coated anodes. The honeycomb mesh is the control grid, The filament is barely visible as a fine vertical line.

This example shows strangely shaped anodes which were intended to produce an easier to read display. Notice that it has eight segments, so this is not a seven segment display!