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From: bob urz on 1 Jan 2010 01:45
http://www.bvws.org.uk/405alive/tech/safety.html

I especially like the radioactive turntable....

bob
From: root on 1 Jan 2010 06:56
bob urz <sound(a)inetnebr.com> wrote:
> http://www.bvws.org.uk/405alive/tech/safety.html
>
> I especially like the radioactive turntable....
>
> bob

At one point the article cited says electricity doesn't give any
warning. It has always been my experience that I can very lightly touch
and move my finger over a hot chassis and feel a sort of vibration. I
never got a shock doing that.
From: Samuel M. Goldwasser on 1 Jan 2010 08:17
root <NoEMail(a)home.org> writes:

> bob urz <sound(a)inetnebr.com> wrote:
> > http://www.bvws.org.uk/405alive/tech/safety.html
> >
> > I especially like the radioactive turntable....
> >
> > bob
>
> At one point the article cited says electricity doesn't give any
> warning. It has always been my experience that I can very lightly touch
> and move my finger over a hot chassis and feel a sort of vibration. I
> never got a shock doing that.

Yes, in fact, not even just a hot chassis, but any equipment that has
RFI filters and doesn't have its case grounded.

P.S. The hot chassis thing assumes you don't have your other hand on a
ground! It would very likely be more than a vibration in that case. :( :)

P.S.2 This is also the reason you can use a common neon tester to check
for live wires without having to connect the other probe to Neutral or
Ground.

--
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From: Jim Yanik on 1 Jan 2010 09:58
sam(a)repairfaq.org (Samuel M. Goldwasser) wrote in
news:umy0yklq5.fsf(a)repairfaq.org:

> root <NoEMail(a)home.org> writes:
>
>> bob urz <sound(a)inetnebr.com> wrote:
>> > http://www.bvws.org.uk/405alive/tech/safety.html
>> >
>> > I especially like the radioactive turntable....
>> >
>> > bob
>>
>> At one point the article cited says electricity doesn't give any
>> warning. It has always been my experience that I can very lightly
>> touch and move my finger over a hot chassis and feel a sort of
>> vibration. I never got a shock doing that.
>
> Yes, in fact, not even just a hot chassis, but any equipment that has
> RFI filters and doesn't have its case grounded.
>
> P.S. The hot chassis thing assumes you don't have your other hand on a
> ground! It would very likely be more than a vibration in that case.
> :( :)
>
> P.S.2 This is also the reason you can use a common neon tester to
> check for live wires without having to connect the other probe to
> Neutral or Ground.
>

body capacitance couples a small amount of voltage through you to ground.
That's how the neon bulb lights.

--
Jim Yanik
jyanik
at
localnet
dot com
From: Phil Hobbs on 1 Jan 2010 11:12
On 1/1/2010 1:45 AM, bob urz wrote:
> http://www.bvws.org.uk/405alive/tech/safety.html
>
> I especially like the radioactive turntable....
>
> bob

Fun. Not 100% accurate, though--the getter inside tubes is not mercury,
it's usually barium or sodium metal. Mercury has a high vapour
pressure, and was used in mercury vapour rectifiers and thyratrons, but
not in ordinary tubes. Also there's nothing too nasty about lithium
other than that it burns easily.

Happy New Year

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
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