If you have a regulated power supply (ideally a 2-channel lab supply), you can figure out the pinout and operating conditions by looking at the interiors and powering it up. Find the connections of the filament, connect the supply and slowly increase the voltage until you see the wire to start glowing - this will be the maximum operating voltage. I guess that it will be in 1-1,5V range, so start from ~0,5V. After figuring the filament, find the grid and anode connections and apply some higher voltage to both, my wild guess is that a 25V anode voltage should be right for continous operation, and 40-50V with pulsed operation. My guesses are based on other russian VFD tubes from same times, so I think the technology would be similar. If you are afraid of destroying the tube, start with ~5V and raise until the phoshor area is lighted evenly. Of course, those voltages should be connected to a commong ground level (so one end of filament would be on the same voltage level as negative voltage terminal from high voltage supply). It seems to have identical dimensions as IN-28. Also, when looking at IN-28 datasheet, we can see anode, cathode and grid. This is curious, as nixies do not use a grid, just anode and cathodes. This weird 0 symbol on top of IN-28 might be for "dimmed" operation mode or it's there just because in IV-29 that's the filament connection, so my another wild guess is that the same pins are used in IV-29 - filament in place of "anode", grid in place of "grid" and anode in place of "cathode". This would make perfect sense as in nixies it's the cathode thad glows, and in VFD displays it's the anode.
The only thing that cannot be really measured is the maximum anode voltage. Without datasheet the only way is to set the anode voltage, leave it for operation for a month, check if it changed, raise the voltage by 5V and repeat. So the safest way is to use the lowest voltage that provides even lightning. W dniu niedziela, 14 maja 2017 03:20:56 UTC+2 użytkownik Mark03 napisał: > > Several years ago I purchased two IN-28 and two IV-29 from a gentleman in > Ukraine. The IN-28s I used in a Nixie clock project, but the IV-29s are > still sitting in my tube collection. If I had any data at the time, I've > since lost it, and careful googling doesn't offer any hints. The IV-29 > does not appear in Dieter's data archive. > > Clearly someone knows how to light up a IV-29, as there are modern photos > of it glowing a pretty turquoise. Does anyone here know the pinout, or > better yet, have an actual datasheet? > > Thanks, > Mark > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/61184a92-5c53-4513-95dc-b210d471b3b4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
