Have you ever been to a welding shop and observed what happens to arc-welder cables when an arc is struck? I have and I saw the cables jump about on the floor. At its maximum ratings of 4000VDC and
All, The "jumping cables" can also be seen if you've ever jump started a car. Watch what happens when the car with the "dead" battery is cranked. This is of course a substantial amount of instantanio
Fine - so where *did* the force come from that bent it? Eric has just shown that the EM force between two parallel wires is about 1/1000 of an ounce for the conditions he assumed (two 1in wires separ
The evidence speaks for itself. Eimac has not wavered from the conclusion that an "oscillation condition" causes gold evaporation from the grid of an 8877. I still wonder why Eimac's Reid Brandon to
I like this discussion; I hope everyone involved remains objective in their responses. I have no doubt whatsoever that Rich has seen what he claims, yet his proposed physical process so far seems not
If electric current can move heavy Cu welding cables a few inches, the effect does not seem trivial. New Eimac 3-500Zs have a grid withstanding potential of 8 - 9 kV. The amount of bulge from the be
Many of the denizens on AMPS find discussions of parasites odious. The only semi-plausible explanation to bent filaments is that some Hams are using their 3-500Z amplifiers in aerobatic airplanes -
I have just spent an entire semester working on electro magnetism and the physics is VERY fresh in my mind. Eric's calculations are sound, I am sorry Rich but you are way off the mark here, there is
** I need some measurements during the big-bang that preceeded a grid-fil short. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end
Author: Dominique.DEHAYS at enac.fr (DEHAYS Dominique)
Date: Wed Feb 5 02:41:30 2003
I suggest that you re-think this one. I can quote some equations at you if you wish. So if the equations say it is impossible , either they are wrong or there is another phenomena , because I got dem
If the thoriated tungsten filament was not at a temperature of 1820?K, probably nothing would bend during an event. cheers, Dom - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/me
Author: stevengrant98 at yahoo.com (Steven Grant W4IIV)
Date: Wed Feb 5 13:42:20 2003
the thing you fail to see here is that there is parasitic current flowing here. it cannot be running in the tank circuit cause it is blocked there, so it is either jumping gaps to complete its curcui
realm Yea verily, Rich! In my past life I did high current trip testing on 480 volt circuit breakers. 50,000 amps was not unusual but even much lower currents would make welding cables jump off of t
Hi, Just ask some Navy old salts who did some magnetic minesweeping.........Maybe amazing their experience in that matter. Jos on4kj ( used to be a sparky on those corks in the fifties). -- Original
This can be easily explained, the welding cables are subject to the earths magnetic field and any other localised magnetic fields, that's why they jump about. The question is, would this happen in a
Hi The earth's magnetic field and any nearby ferrous metals too. A typical aluminium amplifier chassis is a good shield to electrical fieldsb ut is a very poor shield to magnetic fields. A colleague
Tubes are immune to Earth's magnetic field ? Good question. What is the fusing current of #28 Cu ? It must be at least 15A, and yet the 3-500Z cathode/filament is theoretically not capable of such a
of near to What is the temperature rise in the cable at such high currents? Could not a sudden rise cause the metal to expand and at least explain some of the movement? 73 John Morrow Gi4ksh
wow. 50k amperes is like a smallish lightning stroke. About as big as your thumb? For years, accepted aeronautical engineering theory said a bumble bee can't fly. The perplexing thing about bent fil
Exactly 15A - good guess! However, a significantly larger current would be needed to fuse #28 wire with the single short pulse we're talking about here. You may have answered your own question - elec