Hi Graham, Thanks for your answer.
I just discovered the GTE175M and GDE120T are unsuitable, because the datasheets say the first only can manage frequencies up to 1kHz and the second has a ionisation time of 1 ms and a deionisation time of 5 ms. So the challenge is to find a circuit that can amplify the output of the clock oscillator to an appropriate level at at least 500 kHz and to find a transfer circuit that is able to manage >40 kc's. Otherwise I will need to devide the clock to less a s 1kHz by logic circuits. Scans of the original size at 300dpi bitmap size in PNG format are most convenient, for they have the smallest file size. Also PDF's made fron such scans are sufficiënt. Please don't send color scans, for they are trice as big as greyscale images. For photo's and greyscale immages I always use greyscale scans in jpeg at high quality compression (8 to 10) or even TIF's. Thanks for helping me. I will look what I can do with the German booklet. There is an other guy intrested too. eric -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Grahame Marsh Sent: vrijdag 25 maart 2011 13:13 To: [email protected] Subject: Re: [neonixie-l] Re: 3rd try! Mullard Z700 U trigger tubes Eric Yep, I forgot about the EZ10B but it is available and fit for 1 MHz. Again I've never played with one. I've used the much larger and clunky dekatrons. I have Electronic Counting Circuits as a book so I can scan the pages you list. What dpi would you like them scanned at and what file format? The book is too large for my A4 scanner to do 2 pages per scan so you'll get one page per image. I will zip them and then let you know where to download them from (rather than what might be a large email attachment). I also have 2 other books by Dance "Cold Cathode Tubes" which circulates as a pdf and "Photoelectronic Devices" (1969) which I have still to scan and pdf. My German is rudimentry: numbers, thank you, yes, no, food, beer and wine (the essentials) so I can get by... I'd like to see the book (I guess others would as well) because the diagrams will be universal. My wife's German is much better than mine and I normally use her as my translator. Grahame On 24/03/2011 16:53, Tidak Ada wrote: > 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. -- 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.
