Grahame, Thanks for your answer.
Those EZ10B's are specified for f(t) of 1 Mhz ! I have a 10ppm 400kHz TCXO, so I hope I can manage these high frequencies. However, I am afraid the drivers will make the bottle-neck, Before I got the dekatrons, I planned to devide with CMOS, but the challenge of an (almost) all tube design is temptative. Must I suppose you have no experience with those high speed dekatrons ? The choice for cold cathodes is to minimize the supply power. Thanks for sending the MC Neale book. I forgot to send this answer to your last reaction to me. Therfore I was a little confused about the book. Thought first it was an answe on my quetion below: About the Dance book: Do you have a complete scan of all pages or is it the same as my copy and do you miss the pages 310 - 374 ? And what about the pages 376 to the end (containing the register) ? In case you have the missing pages within reach, I should highly appreciate a (pdf) copy of them to complete my book. In case you understand the German language, I possibly can serve you a copy of "Glimmröhren und Kaltkatoden-Relaisröhren"; Radio Praktiker Bücherei 28; Franzis Verlag by Otto paul Herrnkind (160 pages). Kind regards, eric -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Grahame Marsh Sent: donderdag 24 maart 2011 10:08 To: [email protected] Subject: Re: [neonixie-l] Re: 3rd try! Mullard Z700 U trigger tubes Eric I've never used a GDT125T but I have used GTE175M as an interstage coupler using the commonly available circuit. Not suprisingly it worked! I've only divided by 50 from 50Hz to get 1pps. Using a divide by 10 dekatron driven with sine wave , a GTE175M coupler and a 10 cathode dekatron with cathodes 0 and 5 commoned together to get divide by 5 - a trick that works in 50 Hz land but a 12 cathode dekatron would be needed in 60 Hz land. I have also built vacuum valve couplers -the advantage is a simpler power supply the disadvantage is the heater supply. 400kHz is a real challenge for gas filled counting. Mostly a count in the 10's kHz is the highest you'll get. The 6879 has a maximum frequency of 5 kHz for example. High vacuum counters (eg E1T) get to 30 kHz (selected tubes get to 100 kHz). But that said, there were some remarkably high speed gas filled counters made just as the semiconductor was taking over. But are they available? Grahame On 23/03/2011 22:22, Tidak Ada wrote: > Grahame wich tube is more usefull to focus on to drive dekatrons: the > GTE175M or the GDT125T ? > I liked to make a clockrate divider beginning with two Elesta EZ10B, > followed by three Sylvania 6879's, preferrably driven bij cold cathode > tubes, and avoiding semiconductors. The highest frequency to manage is > 400kc's > > eric -- 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. -- 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.
