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Forums
4hv.org :: Forums :: General Science and Electronics
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has anybody ever made a tesla tuner out of a seeing eye tube
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teravolt
Sat Dec 31 2011, 04:29AM Print
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		I am looking for ideas. alot of old radios used to use thease tubes in old radios. I basicly know how to use thease tubes so I'm kooking to see if any body has tried this. I sapose one could use a sweep generator and a detector diode and a op-amp to drive it
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Sulaiman
Sat Dec 31 2011, 10:42AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
 		In uk we call them 'magic eye' tubes
and they are just a non-linear un-calibrated voltmeter
so anything (that can be converted to a voltage) can be 'tuned'
e.g. error signal in a pll, grid-dip type meter,
I think a sweep generator / ac signal could be fed directly to the eye tube
but a detector would give a brighter steadier display.
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teravolt
Sat Dec 31 2011, 06:40PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		typicaly I use a pulse generator and o-scope wich probibly tell me what I would want to know but it would be nice to have something portible and magic eye tubes have a cool look. I would like to be able to sweep a tesla fully built and see the upper pole and lower pole or resonant peak. I might add a frequency counter so I mark the frequencys. thanks for the help.
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radiotech
Sat Dec 31 2011, 06:53PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
 		A far more productive alternate use of an (magic eye ) electron ray indicator
is an experiment to determine the mass of an electron.

If you place the eye tube into a solenoid, there is a relationship between the
magnetic field and the swirl radius of the distortion.

So, with your thinking cap on, and knowing this value 1.5924(17)×10−19 C,.....
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teravolt
Mon Jan 02 2012, 07:06AM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		thanks radiotech, I found this website and a couple others

Link2

that I'm looking for. I started this thread to find some good things to measure in a Tesla. right now I am working on a CM300 DRSSTC and I'd like to see things like frequency drift or primary current when a spark is being generated. I just think they look cool and would make a good visual addition. when I get a chance to do this project I will revive this thread when I find out to measure and implement.
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radiotech
Tue Jan 03 2012, 12:26AM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
 		All the "usual" on the net is rehash of what those tubes did in the past.

This experiment, although about 50 years old, can be used with minimum
apparatus to consider some science.

We had fun doing this. Less fun doing the math. No calculators. amazed




1325550376 2463 FT131243 Magiceyephysics
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teravolt
Tue Jan 03 2012, 04:19AM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		thanks for scanining it for me I'll take a look at it
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Conundrum
Tue Jan 03 2012, 08:52PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
 		Have a salvaged tube here as well as a presumably working "flat" CRT, anyone have a use?

-A
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