in=20
12AX7=20multiple
saturation.
like
current
screened room
ray radiation.
Not so much Xray as short wave UV, 253 nm and 185 nm. Xray production usually requires much higher anode voltages (many kV).
5V DC on AC Mains
Jun 20, 2011
29 Replies
=20
usually=20
what=20
feedback=20
A bit of thimking. Assuming you have a 100 A service at 120/240 V (US standard). The limit feeder drop is 3% or 3.6/7.2 V or maximum Z of = about
0.3 Ohm. 5 V(dc) flowing 0.3 Ohm gives about 16 A. You should be able = to find that with circuit breakers tripping or fuses blowing. =20 If that is not happening you may very well have a measurement error, = where something is causing a false reading on your meter. Try looking at it with an oscilloscope to see what other signals are there.On a sunny day (Thu, 23 Jun 2011 12:50:56 -0700 (PDT)) it happened whit3rd wrote in :
produced,
The rectifier tubes are clear when new, but get colored after many hours of X ray exposure. They are not manufactured colored. There are some pics on the web, if you google.
5 volts doesn't sound reasonable. What DC voltmeter range were you using? You may be seeing voltmeter overload.
John
"John Larkin"
** The OP did not say he actually read any such value an a meter - but in general, you cannot read the DC component of a 120 or 230 volt AC supply with just a DMM set to DC volts.A little bit of AC filtering is needed first - say a 1Mohm resistor and a
2.2 uF film cap in series across the supply, then read the DC voltage on the cap with a DMM.Allow 10% more for the effect of loading from the 10Mohm input of the meter.
I'd be surprised if you see more than 0.5 to 1 volt.
.... Phil
Mercury Vapor rectifier.
It's easy to think outside the box, when you have a cutting torch.
As "hifi-tek" said several days ago; it's the tungar lamp rectifier that I was thinking of...
I've never thought of mercury vapor rectifiers as high current/low voltage devices.
I was off the group for a week.
They were used to power subway trains. They can be builkt to about any scale they needed. I've never seen a low current mercury vapor rectifier, and doubt they would be practical.
It's easy to think outside the box, when you have a cutting torch.
The classic that I have used was the 866A; good for a few KV but only a few hundred mA.
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
It would make a lousy detector, wouldn't it? :)
It's easy to think outside the box, when you have a cutting torch.
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