westdave /on the NE-70 i got one and it had cathode poisoning after sitting for how many years unlit ? i took it down to 1k at 5wa...@115 vac and every thing got warm to hot but the funk would not blast away and is still there after many hours(when it is hot you must keep an eye on it ) ,what's next ,bombarding?a lower value resistor ??(hot hot)
)n Nov 4, 7:04 pm, threeneurons <[email protected]> wrote: > > Those are the ones. ... I'm hoping they're just large neon bulbs and that > > only two pins are used. > > http://cgi.ebay.com/ws/eBayISAPI.dll?VISuperSize&item=160498913376 > > That they are ! I actually had a pair of those in my hand, from the > same source. The eBay seller is brokering them for a guy, who doesn't > have an eBay account. Westdave knows both of them, and got a pair from > the guy. > > Dave also had me test the pair that he had. They are most likely > cathode poisoned. But probably not in a permanent way. Just run them > for a while and it should clear up. I used a small portable test jig > to run them. It can't deliver more than 15mA at 180V, so only a small > portion lit up. > > When you get yours make a simple burn-in jig, using the household > 110VAC and a power resistor. I'd start with an assumed sustained > voltage of 70V (just a guess), and peak current of 20mA. 165V (peak > value of 120Vrms) knock off 70V, gives you 95V. 95 goes-n-ta (see > Beverly Hillbillys - Jethro & Advanced Math) .02Amps, 4750 times. So > that's ~4.7K, and 95 times .020 (20mA) is ~2Wpeak; ~1Wrms. A 5W power > resistor should do fine. See how much of the electrode surface lights > up, and see if it grows after a few minutes. If not, make the > resistance smaller. Cut it in half. Keep an eye on it. Don't do a 'Dr > Conrad Murray' (see Michael Jackson), and ignore your patient. Results > may end up similar. -- 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.
