I have restored a few different radiation counters which use E1T as the fast counting stages and then usually a 2D21 to drive either a relay or an electromechanical counter in the slowest stage to save cost. Have a look at this one which I owned previously: http://www.radiomuseum.org/r/neva_kurzzeitmesser_1022.html. I've also owned a Phywe 9029 like this one: http://www.radiomuseum.org/r/phywe_zeitmess_und_zaehlgeraet.html which also uses the 2D21 (PL21) to drive the counter. I sold them all after having restored them and after having learned what I wanted to learn from them.
I've used the GTE175M in many of my projects and I like them, partly becuase they were designed to drive Dekatrons but also because they are "well behaved" and seldom fail nor miss-trigger. Learning of more nice "glowing" valves is always interresting! On 17 Dec, 21:33, threeneurons <[email protected]> wrote: > On Dec 17, 11:27 am, Dekatron42 <[email protected]> wrote: > > > Thanks for explaining! > > > I'm more used to using the 2D21 in similar circuits and also for > > pulsed relay driving, there a choke and capacitor is usually used for > > the self extinguishing circuit. > > A 2D21 or a 1D21 ? > > The 2D21 is a heated filament thyratron, which would work, and will > have a more behaved flash rate. But the 1D21, which is a neon strobe > tube will have a more dramatic effect. Its not intended to drive a > dekatron, but the pulse is more than adequate to pulse a dekatron > directly. Or are you just using the 1D21 to flash ? > > I made a ruby laser flash circuit many years (decades) ago. It had a > LRC network for dumping charge into the flash tubes. They had to be > carefully calculated, or else the flash tubes would explode. That > wasn't as dangerous as it sounds. The tubes,and rod, were enclosed in > a dual elliptical aluminum housing, that would catch the glass > (quartz ?). Down side, is that, that housing would get all scratched > up. The rod not so much. That seems to P.O. the bosses. -- 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.
