Incoming testing of the SI-22G tube was done, at work, using a Co-60 source in addition to background measurements. An off-the-shelf GM-tube supply was used, in order to get the bias low enough for this (giant) tube. Please see the files section for the incoming test data. There's also a photo up, now, that shows the slightly-dodgy wiring setup that was needed to bench test this tube.

Bottom line is that it seems to work happily, and I now have a bit more of a push to get testing with the CCFL-transformer-based HV supply.

Note: I'm starting to think that a different transformer might be a bit more sane with such a low bias voltage. I'm much more used to the 750~800V devices, like those made by the usual suspects like LND, Philips, Saint-Gobain, etc. which are much closer to the typical output voltages of these CCFL transformers.

PS I'd completely forgotten, until yesterday, that I'd recently intercepted a coax cable heading for the recycling depot, with MHV connectors already on it. Photo of that critter is also posted.

-Does it count as dumpster diving if it hasn't actually been tipped into the dumpster? Splitting hairs... ;)