[time-nuts] NTP Synchronised Nixie Tube Clock

[Bill Hawkins]

I can tell you that the IBM 704 vacuum tube computer from the
fifties used lots of glass diodes in its 8 tube plug-in units.

I still have a few. They'd make great module frames for your own
version of a vacuum tube clock. Sorry, no sockets.

Bill Hawkins
 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Arnold Tibus
Sent: Tuesday, May 08, 2007 3:18 PM
To: daun at yeagley.net; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] NTP Synchronised Nixie Tube Clock

Hello,
as I do not have problems with this strange lange, I hope I can help
finding the answer ;-) According the description, not having started
with a ready overall design the developper Friedhelm Bruegmann did work
7 years on it! 
He did start, because he had the idea to bring all his collected valves
into practical use after a long period of collection.
A lot of appearing technical problems had to be solved then. Therefore
it was not possible to have a clear idea about the power needed for this
project, which finally gave him some headaches. Though theoretically
possible to avoid  all semiconductors totally, the transformers of
choice turned out to be too small. As there are already 103 vacuum tubes
in use, just the heater current levelled up to 39A! But, as at the time
of digital breakthrough semiconducter diodes were already in mixed use
with VTs, Friedhelm did not see a breach of style to use SC-diodes. He
applied 4xBY227, 66xBA157, 72x1N4148. All these parts are clearly shown
in the diagrams and mentioned in the description. I stopped thinking
about the bigger size of chassis he would have needed.
Anyway, a outstanding development! 

Beside, did ENIAC use any semiconducters? 

The run-up you can watch here:
http://www.jogis-roehrenbude.de/Leserbriefe/Bruegmann-Digital-Roehren-Cl
ock/mov002.zip
The set-back is shown here:
http://www.jogis-roehrenbude.de/Leserbriefe/Bruegmann-Digital-Roehren-Cl
ock/mov003.zip
The total schematic:
http://www.jogis-roehrenbude.de/Leserbriefe/Bruegmann-Digital-Roehren-Cl
ock/sheet001.pdf 

greetings,

Arnold, DK2WT



On Tue, 8 May 2007 12:34:52 -0400, Daun Yeagley wrote:

>Ah, but I saw some glass semiconductor diodes in there!  Look about 
>half way down the page.  Could they be 1N914's?  (I don't do German)

>Daun

>-----Original Message-----
>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On

>Behalf Of Maggie Leber
>Sent: Tuesday, May 08, 2007 12:02 PM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] NTP Synchronised Nixie Tube Clock

>On 5/8/07, Jason Rabel <jason at extremeoverclocking.com> wrote:
>> Lol, as I was reading the posts I was thinking, "I bet Tom hooked one

>> up to his Maser"....
>>
>> And sure enough the proof is in the pictures. ;)
>>
>> You guys crack me up.


>Of course, a truly hard-core Nixie tube clock wouldn't use 
>semiconductors at all.

>http://www.jogis-roehrenbude.de/Leserbriefe/Bruegmann-Digital-Roehren-C
>lock/Digi
>tal-Roehrenuhr.htm

> (or http://tinyurl.com/3632h )

>http://www.eldocountry.com/projects/tubeclock.html

>--
>73 de Maggie K3XS
>Editor, Phil-Mont Mobile Radio Club Blurb - http://www.phil-mont.org 
>Elecraft K2 #1641 -- AOPA 925383 -- ARRL 39280

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