Valve [tube] filaments [heaters/cathodes in this case] generally do not have
life extended by running lower power.
Cathode emission is complex and heater should be run within the specs. That
spec is not just to achieve maximum rated emission.
Some oscilloscopes had a connection for cathode modulation of brightness.
John K.
----- Original Message -----
From: "Michel" <mic...@xiac.com>
To: "neonixie-l" <neonixie-l@googlegroups.com>
Sent: Wednesday, December 12, 2012 7:45 AM
Subject: [neonixie-l] Re: Sgitheach web page update
Great design and source of information Graham! Fantastic.
Just wondering about 1 thing, is it possible to adjust the brightness
of the scopeclock according to the ambient light? Usually you would
use the control grid of course, but what it you would adjust the
current through the filament? It would both lower the power
consumption and increase the life of the tube, I would expect?
The IN9 / IN13 bargraph clock is my next project!! Tubes are on the
way but hope I will have some time to work on it :-)
Michel
On Dec 12, 12:51 am, Grahame Marsh <grahame.ma...@googlemail.com>
wrote:
Hi
I have added a webpage where I test a variety of other small CRTs with
the scope clock 2 hardware.
http://www.sgitheach.org.uk/scope2a.html
This page will continue to carry updates as I trial other CRTs and other
PSU configurations. I'm still extending the range of clock faces and
adding multi language support.
The rubidium oscillator clock workover is completed and the designs are
all here. The complete software including the source code written using
the free GCC -AVR C complier is available for download.
http://www.sgitheach.org.uk/atomic.html
The Giant 7 "Jon Ellis" Segment Clock page now has the software (again
GCC-AVR) available for download.
http://www.sgitheach.org.uk/ss.html
Cheers Grahame
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