IV-13 is an extremely rare numitron tube. They are the largest and the most beautiful numitron tubes you can ever find. IV-13 numitrons are the ultimate choice for your clock! No wonder they are called "The queen of all Numitrons!".
Displayed symbols: 7 segment;
Symbol height: 20mm (0.79");
Overall dimensions: 22mm (0.87") dia. X 52mm (2.05");
Pin diameter: 1.02mm (0.040");
Filament voltage, V: 4.5 (max 6.3V);
Brightness, Kd/m2: 10000.