Re: [Drakelist] Basic electronics
Sorry for posting my replay to the wrong subject and recipient. It was a fat finger mistake. Was very interested in the L-4B article and was typing faster than thinking. Happens more and more these days! Again, apologies for the misdirected response.. Here is the correct response routing to Neil: Hi Neil: Well the analogy to solid state is that of a diode to a transistor, or more accurately a FET. The addition of a third element to a vacuum tube diode turns it into a triode. The control grid creates the leveraged control element which enables current control via a very small signal applied. It is the grids physical proximity to the cathode that gives it the leverage it needs to enable gain. Simple answer. Curt KU8L Neil M Califano wrote: How does a tube amplify AC current if tubes are used to rectify current? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Basic electronics
How does a tube amplify AC current if tubes are used to rectify current? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Basic electronics
Have a look here: http://www.radio-electronics.com/info/data/thermionic-valves/vacuum-tube-theory/tube-tutorial-basics.php Also look for the book Understanding Amateur Radio. It was published by the ARRL back in the 70s. IMO one of the best books ARRL ever published on radio and electronic theory in the tube era. 73, Ron WD8SBB --- On Sun, 5/1/11, Neil M Califano cchange...@yahoo.com wrote: From: Neil M Califano cchange...@yahoo.com Subject: [Drakelist] Basic electronics To: Drakelist@zerobeat.net Date: Sunday, May 1, 2011, 5:23 PM How does a tube amplify AC current if tubes are used to rectify current? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Basic electronics
Neil, In a Class A amplifier a D.C. bias voltage is applied to the input grid circuit. This prevents the A.C. output signal from being rectified. Since a Class A amplifier is the least efficient, other classes of amplifiers are used for CW, FM, etc. -Tom, AG9X On Sun, May 1, 2011 at 4:23 PM, Neil M Califano cchange...@yahoo.comwrote: How does a tube amplify AC current if tubes are used to rectify current? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
