Talk:Triode

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I am afraid that most filaments require a two wire connection to allow current to flow through them to cause heating. The filament heater is sometimes separate and sometimes electricaly isolated from the cathode. So a triode may require 4 or 5 leads. I think leaving this out may confuse some. Perhaps someday more about their history could be added. I believe this invention is attributed to Lee DeForest and that triodes were originally called audions. I also think there was some confusion about the importance of vacuum. I think the issue was resolved with the introduction of the "getter".

See Vacuum tube, we don't need to duplicate this information. In fact it might be good to merge this page with that. --Mystic Pixel 07:21, 9 April 2006 (UTC)

Contents

[edit] Gas-filled?

I doubt that the British call a VACUUM tube a GAS FILLED tube. One has gas, the other cannot.Thortful 07:25, 10 Nov 2004 (UTC)

I removed the link, it doesn't make sense... --Mystic Pixel 07:23, 9 April 2006 (UTC)

Vacuum tubes and gas filled tubes are both glass tubes that have function in a circuit.. Vacuum Tubes are linked to Gas and vice versa, but it really doesn't matter that much

[edit] De Forest's patent

De Forest thought some gas was necessary to make the Audion work, and this is in his patent. In fact they worked in spite of the gas not because of it. De Forest wasn't worried about the physics except where his patent was affected. PAS 02:46, 18 August 2006 (UTC)

[edit] Workings same as transistor?

I know that the triode and the transistor are worlds apart as far as how each works internally. However, can one theoretically replace the other if the transistor is a high power consumption transistor?

They're different in implementation, but not in theory, as far as internal workings. I'm not sure what you're trying to get at (as transistors are normally used to replace triodes, not the other way around) but the answer is quite simple: use a high-power triode. See the Vacuum tube page, where it talks about high-power tubes. --Mystic Pixel 07:21, 9 April 2006 (UTC)

the wikipedia article on valves states that the origional audion (now called a Diode) was invented by John Ambrose Fleming, in 1904, this article seems to contradict this. could anyone explain?220.233.74.219 07:46, 15 May 2007 (UTC)

[edit] Don't merge

I don't think the page should be merged with vaccum tube because the term triode has its own meaning in the realm of solid-state electronics. It refers to a mode of operation in which output current is (more or less) linearly dependent on the voltage across the output terminals (drain-source, emitter-collector) voltage, as opposed to operating in the saturation region. I.e., transistors in this region act like resistors.

So, maybe a more general discussion on what triode operation means for vaccum tubes and for transistors is in order.

Also, transistors were initially referred to as triodes themselves (or "crystal triodes"). So, the term triode really describes the function and not the particular technology used.

[edit] No

Don't Join Pages It Helped Me alot!

I removed the merge tag. I think the page could eventually have a discussion of triode circuits, etc. Give me some time and I'll get around to some expansion. - mako 21:40, 2 May 2006 (UTC)
OK, I see your point. Fair enough. Mystic Pixel 00:33, 19 May 2006 (UTC)

Triode and Transistor both amplify stuff don't they? Explain it more on the triode article please

[edit] ... triodes are still more linear at audio-frequency ranges...

This is a rather barmy assertion. All amplifiers use negative feedback to compensate the non-linearities of their amplifying elements. From what I gather, valve amps produce a "warmer" sound because they saturate more gracefully outside their linear range. Transistor amps tend to cut out abruptly outside the linear range, resulting in a harsher sound. (This is discussed a bit in Valve sound).

If people are claiming that valve amps are more linear, then they're wrong. I'm going to delete this statement unless someone can back it up with a reference. -- Sakurambo 桜ん坊 18:36, 11 July 2006 (UTC)


[edit] Characteristics

We could do with a diagram of typical triode electrical characteristic curves.--Light current 19:31, 1 January 2007 (UTC)

[edit] Triode region?

A lecturer at MIT talks about a MOSFET getting into its "triode region" (the oppose of saturation), e.g. in relation to small signal analysis. What's a triode region? And what's it got to do with triodes? —Pengo 08:28, 27 August 2007 (UTC) ... it's also mentioned in pMOS logic —Pengo 13:07, 29 August 2007 (UTC)