IN-9 is much brighter than IN-13, hence the higher current draw - it is also (IMO) better for display pieces for this reason. IN-13 is a bit better at starting at the bottom but still has its issues. If you want to make it 100x better at behaving, feed it full wave rectified DC but without any smoothing, A smooth DC voltage allows the ionisation to simply travel around on the wire - maybe this is due to contaminants building up with age I don't know... When I tried unsmoothed 100hz (50hz rectified) DC they worked so much better, though I guess this can make driving them a little more tricky. It does also help to let them sit for a few minutes at full power for a while, maybe even drive them 150% or so to clean up the internal structures. They are nice tubes, I can see the appeal over discrete bulbs. I have about 300 or so stashed away, I was going to make a spectrum analyser also at some point, so will keep tabs on your success! - Alex
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