{"id":788,"date":"2017-10-27T09:03:55","date_gmt":"2017-10-27T09:03:55","guid":{"rendered":"http:\/\/delaydude.de\/?page_id=788"},"modified":"2018-06-04T07:04:24","modified_gmt":"2018-06-04T07:04:24","slug":"roehren-amp-part-2","status":"publish","type":"post","link":"https:\/\/delaydude.de\/en\/roehren-amp-part-2\/","title":{"rendered":"How a tube amp works – Part 2"},"content":{"rendered":"

\"R\u00f6hre\"<\/a>In the first part<\/a> we have learned that the flow of electrons can be controlled by striking the strings.<\/p>\n

This flow of electrons inside of the tube can now be controlled by selected resistors.<\/p>\n

They control the voltage of the grid between cathode and anode.<\/p>\n

Current and Voltage<\/h2>\n

One distinction that matters in this context is the differentiation between current and voltage.<\/p>\n

You can imagine the current as an amount of water running through a garden hose while the voltage pictures the pressure of the water. This means: the higher the water pressure (the voltage) the more water (the current) runs through the hose in a certain period of time.
\nBy adding a resistor you can \u2013 in this example \u2013 tighten the hose. Depending on how much the resistor tightens the hose you can control the current (amount of water) as well as the voltage (water pressure).<\/p>\n

Impedance and Transformers<\/h2>\n

This kind of resistor is known to be the output-impedance of the tube and is measured in units of Ohms. To protect the speaker this output-impedance has to be send through an output-transformer. Comparable to a pickup the output-transformer is made of copper-coils and is able to reduce the high resistance of the tube so it can be send through the speaker without crashing it.<\/p>","protected":false},"excerpt":{"rendered":"

Sorry, this entry is only available in Deutsch.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[265,3],"tags":[166,1041,144,1039,1030,289,249,1040,241,903],"class_list":["post-788","post","type-post","status-publish","format-standard","hentry","category-amps-guitars","category-effektgeraete","tag-amplifier","tag-ausgangsuebertrager","tag-impedance","tag-impedanz","tag-lautsprecher","tag-roehrenverstaerker","tag-speaker","tag-strom-spannung","tag-tube-amp","tag-verstaerker"],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p9GLlF-cI","jetpack-related-posts":[{"id":786,"url":"https:\/\/delaydude.de\/en\/tube-amp\/","url_meta":{"origin":788,"position":0},"title":"How a tube-amp works – Part 1","author":"Delay Dude","date":"Monday October 9th, 2017","format":false,"excerpt":"To me as a layperson the functionality of a tube-amp is a phenomenon and because of this fascination I decided to deal a bit more intensively with it. Here I would like to explain (maybe some kind of inexpertly) try to explain how a tube-amplifier with cathode-bias works: Tubes Every\u2026","rel":"","context":"In "Amps & Guitars"","block_context":{"text":"Amps & Guitars","link":"https:\/\/delaydude.de\/en\/category\/effektgeraete\/amps-guitars\/"},"img":{"alt_text":"R\u00f6hre","src":"https:\/\/i0.wp.com\/delaydude.de\/wp-content\/uploads\/2017\/07\/35-225x300.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":3336,"url":"https:\/\/delaydude.de\/en\/netzspannung-und-sound\/","url_meta":{"origin":788,"position":1},"title":"Fluctuating mains voltage = different sound?","author":"Delay Dude","date":"Monday February 11th, 2019","format":false,"excerpt":"Almost every guitarist knows this phenomenon: in the rehearsal room the sound of the guitar was absolutely perfect, and the amp has been situated right in the sweet spot. But live on stage, the magic has disappeared. Surely, there are several parameters that effect on the sound. Mainly the altered\u2026","rel":"","context":"In "7000 questions to the Dude"","block_context":{"text":"7000 questions to the Dude","link":"https:\/\/delaydude.de\/en\/category\/7000-questions-to-the-dude\/"},"img":{"alt_text":"Frag den Dude","src":"https:\/\/i0.wp.com\/delaydude.de\/wp-content\/uploads\/2017\/09\/Frag-den-Dude-300x169.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":5406,"url":"https:\/\/delaydude.de\/en\/den-bias-richtig-einstellen\/","url_meta":{"origin":788,"position":2},"title":"How to adjust the bias of an amplifier","author":"Delay Dude","date":"Friday January 22nd, 2021","format":false,"excerpt":"Some tube amps, like the Fender Silverface Princeton Reverb, do not have a pot to adjust the bias. Several times, I read in forums, that you can simply change the tubes without the need for a further fine-tuning of the bias. Actually, this is wrong. The bias is the quiescent\u2026","rel":"","context":"In "Amps"","block_context":{"text":"Amps","link":"https:\/\/delaydude.de\/en\/category\/amps\/"},"img":{"alt_text":"Tips & tricks","src":"https:\/\/i0.wp.com\/delaydude.de\/wp-content\/uploads\/2018\/05\/Tips-tricks-300x172.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":2705,"url":"https:\/\/delaydude.de\/en\/midi\/","url_meta":{"origin":788,"position":3},"title":"Midi- a musicians boon and bane","author":"Delay Dude","date":"Friday September 14th, 2018","format":false,"excerpt":"Midi is a way to make instruments communicate with each other and has been developed in the 1980s. Unfortunately, there is no midi standard yet, which sometimes causes a lot of problems. Voltage vs. current The midi signal is sent as 0 or 1. The midi cables sent a 5\u2026","rel":"","context":"In "Analog Delays"","block_context":{"text":"Analog Delays","link":"https:\/\/delaydude.de\/en\/category\/pedals\/analog-delays\/"},"img":{"alt_text":"Tips & tricks","src":"https:\/\/i0.wp.com\/delaydude.de\/wp-content\/uploads\/2018\/05\/Tips-tricks-300x172.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":1560,"url":"https:\/\/delaydude.de\/en\/fuzz-as-booster-overdrive\/","url_meta":{"origin":788,"position":4},"title":"Tips & Tricks: Germanium Fuzz as a Booster\/Overdrive","author":"Delay Dude","date":"Monday January 8th, 2018","format":false,"excerpt":"The germanium fuzz was one of the first overdrive pedals that have been available in the first days of history of electric guitars. Those days this effect offered totally new kinds guitar sound. 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