Much obliged, Martin! 2040 was the number I couldn't think of. Besides the date code, there is a paper sticker with a number (72 I think but the tube is at my shop). I will try it out and post results/photos soon!
Mike On Saturday, September 28, 2013 4:34:10 PM UTC-4, Dekatron42 wrote: > > It is similar to QT1257 by EEV which you can find a datasheet for here: > http://frank.pocnet.net/sheets/084/q/QT1257.pdf and the Sylvania / CETRON > 2040 tube, a similar tube was manufactured by Cerberus, called GK11, which > you can find data on here: http://frank.pocnet.net/sheets/174/g/GK11.pdf. > The Otis tubes are usually marked with a number like 70, 72, 72 or 73 which > is the voltage drop that they have when activated. It was important to > replace a tube with another one with the same voltage drop so that the > circuit would work properly as they were connected in parallel and it did > not work properly otherwise. The internal design is identical (as far as I > know) to RCA 1C21 tubes, which are painted black so they won't be activated > by touch or other external fields, which they will be if you remove the > paint (although there might be some difference in the touch sensitive area > on the glass). I have a few 425A2, 2040 and also 1C21's that all work by > touching them. > > /Martin > > On Saturday, 28 September 2013 21:37:40 UTC+2, mjrippe wrote: > >> Greetings folks, >> >> I haven't been too active lately, but I read the digest every day. >> Although I am starting to thin out my collection, I ran across a fun piece >> today - a Hivac 425A2 made for Otis Elevator. Octal base, but only six >> pins. It appears to be a touch sensitive neon switch like some other part >> numbers which I am forgetting right now. A bit of googling did not bring >> up anything useful. Does anyone have a data sheet so I can fire it up? >> >> Thanks, >> Mike >> > -- 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/ec9e9601-442c-4a74-81de-c1fc3106e955%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
