Simple audio amp design

It doesn't have a filament. I'm guessing it's a waveguide radar t/r switch.

..... Phil

Tabby wrote: =============

Tabby wrote: =========== >

.... Phil

Super post

It looks like the t/r switch spark gap. There may be a small radiation source inside to help start the flashover.

Yes, electrons can get through nitrogen. Is it panto season?

and the water & who knows what else

They can, actually--free electrons are stable in pure N2. (Fun fact.)

Not much use for vacuum tubes, of course, because their mobility is the pits.

Cheers

Phil Hobbs

Tabby wrote: ======== >

This demented dude is smoking something I don't.

..... Phil

So they just wander around alone, and don't bind to the molecules? That could be at least a cool science project. One could measure diffusion rates and such.

Is there no such thing as a negative ionized nitrogen molecule?

Right.

There is, but its ground state energy is above that of the neutral molecule plus free electron, so the stable state is free electrons in neutral N2.

Cheers

Phil Hobbs

Conduction in gasses certainly IS a science project, and was quite active half a century ago (creation of fluorescent lights) and important much earlier (big rectifiers with mercury gas).

Georges Charpak got the physics Nobel in 1992 for his contributions.

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Cite please. They did way back before argon was a commonly available industrial gas but that isn't during the modern manufacturing era.

UK makers seem to favour (impure) argon for most domestic sizes of filament bulb (at least back in the day when they still made them).

I'm with PhilH on this. Maybe it is different elsewhere though.

Martin Brown bullshitted: =======================

All the lamps I see come from China or Indonesia. Wanna find out for SURE what they use ?? You will need to pay a visit.

...... Phil

Phil hasn't got a clue how little gas it takes to fill a light-bulb. The cost of the gas is inconsequential.

No. You can break a bulb in an evacuated space and use a mass-spectrometer to see the proportion of argon to nitrogen in the gas inside the bulb. A cheap time-of-flight mass spectrometer would do the job. You'd need friends at university or a research lab to it cheaply - Phil might have to go to China pr Indonesia to find out, but a less psychopathic character wouldn't have to.

Seems to me like you don't have one or you would give it!

True enough. But then why should anyone believe your wild assertions?

It is even easier than that.

Take a blown filament lightbulb and excite the gas inside with a suitably high voltage ac supply. The resulting emission spectrum tells you quite clearly what gas(ses) are present. A classic CD with an aluminised surface makes an excellent high resolution spectrometer.

Or, maybe just pop the bulb into a microwave and look to see it glow? I'd expect low-pressure gas fill, so it should light up, like a dead-but-not-leaky fluorescent tube.

Argon has lines in the deep red, 6965 and 7067 angstroms; nitrogen has something at 5679 that might be visible, but 5752 is for singly-ionized, safe to expect that.

University lab denizen, or glassblower, or neon signmaker, would be the best people to hook into such a project.