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/996688d8-ad84-4b0c-9ff8-d5897c41f3f2%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
