Hi Eric
You need page 134 onwards in Dance Electronic Counting Circuits for
vacuum valve input and couplers upto 1 MHz. Do you have this would you
like me to scan and email?
Cheers
Grahame
On 28/03/2011 22:25, Tidak Ada wrote:
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
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