On Feb 16, 10:08 am, [email protected] wrote: > I don't believe there is a direct way to test with simply a volt meter.
Nope. But the MOD-6 has a nice SEGTST function. I use the MOD-6's power supply, a couple of clip leads, and some 22K resistors. For partially-poisoned segments, I just parallel more 22K's (decreasing the resistance) until the segment fully lights, then let it bake for a bit. That's cleared up the tubes I had with partially- lit underscores. I have a couple weak tubes where parts of some segments will go dark at the lower brightness settings. > Ended up with more bad tubes (b7971's) than I thought I would. ouch. But, > I do have a tube that actually lights 2 segments together (bottom and > low-right-diagonal). Umm, no font that adds segments. I've only ever received 2 duds, both from the same seller. I'll wait for him to make good before deciding whether or not to name him. One had the anode wire completely vaporized inside the tube (tested without current-limiting) and the glass sleeve rattling, while the other had a bad segment (left-side upper vertical). I've received tubes that were partially cathode-poisoned and some with weak segments. Most were recoverable. > The auction for 4 is beyond normal pricing. There are other others as > well. One issue I believe pricing have gone up is that we are all competing > against each other for them. We should all get together and not bid against > each other. I am SURE it will help. There's a US eBay seller who frequently lists pairs at $190, buy-it- now. The duds weren't from him. The best I've done recently is $75-ish per tube. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
