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
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