Hi, TIL306/7 is a decadecounter, latch, dekoder+driver and led-bar display, and has a puls-input to the counter. TIl308/9 is a latch, dekoder+driver and led-bar display, and has BCD-inputs for data to be displayed. 306 and 308 are identical in its display-dimensions and aparance, the function differs however. To use a TIL 308 as a replacement for a 306 you will need to add externalley somewhere a 7490 decade-counter between the original circuit and the TIL308. I have a few TIL308 available, if this rework is feasable to you. TIl310/1 is a latch, dekoder+driver and led-pixel display, and has BCD-inputs for data to be displayed. Thisone also needs an external 7490 counter in your usage, on top of that, the display has a different appearance. Someone else could have those for you. So, choose the alternative that best suits you, I would continue to search for the original TIL306, or change the whole display to something else althogether. HTH Frank Arnold