aarond1553552714 Posted September 24, 2010 Posted September 24, 2010 I found the following very useful as an introduction to some aspects of tubes and their use in circuits. http://www.tpub.com/content/neets/14178/css/14178_13.htm Until now, I've just not understood how a triode works to amplify an input voltage. Either I am really thick (a distinct possibility:)) or just needed a slightly different angle on things.
little blue penguin Posted September 24, 2010 Posted September 24, 2010 aarond;133949 wrote: I found the following very useful as an introduction to some aspects of tubes and their use in circuits. http://www.tpub.com/content/neets/14178/css/14178_13.htm Until now, I've just not understood how a triode works to amplify an input voltage. Either I am really thick (a distinct possibility:)) or just needed a slightly different angle on things. Tubes are truckloads easier to understand than Transistors. When I started electronics training in the RNZN tubes (or valves as we called them) were the first active device covered. When we moved on to transistors I could follow all the explainations but could never get a real handle on how it could actually work. FETs are similar to valves from the point of view of a relatively negative voltage being applied to stem the flow of current, so I felt at home with them too.
MosfetMainac Posted September 24, 2010 Posted September 24, 2010 It took me a while to get my head around them too, I understood how they worked, but the circuit topology didn't make sense to me until I realised they were voltage amplifiers, whereas all the circuits I had breviously had been current amplifiers. Interestingly though if you hook them up backwards (in a sense) they become current amplifiers too. Lots of fun mucking about with them although Im sure I should be much more weary of the high voltage supplies. Exact reverse for me being trained on transistors and chips.
Owen Y Posted September 25, 2010 Posted September 25, 2010 I like to think of valve operation in terms of electron emission, attraction/repulsion & electron flow. Aaron, that website is good, but rather detailed. The most concise explanation of valve operation, I find, is always the RCA Receiving Tube Manual - the opening couple of chapters in particular are a good read.... Jon's thread earlier this week had a link to a technical books site, which has a number of editions of the RCA manuals, in PDF: http://www.tubebooks.org/tube_data.htm The 1934 edition, RC-12 is the smallest d/load.
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