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Old 19th September 2012, 05:32 AM   #1
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Question exactly HOW does a tube amp work? or a vacuum tube?

the little tube thingies in amplifiers? there are ones in TV's which are also vacuum tubes or similar as well but i dont think you can get them out to use in an amplifier circuit....
they're glued in there pretty good and where would i even find a decent tube amp or vacuum tube that i can observe because i REALLY want to actually look at it and see everything inside of it..
i am terribly horrible at reading drawings of diagrams of things like this.

the only one that i can do is the one with 4 diodes full sinewave rectifier thingy
all the other ones are a complete mystery to me
i cant even build a simple two transistor audio amplifer trust me i've tried

so i was wondering if i could try a vacuum tube amp instead because it makes a little more sense to me than the transistor amps

a really long time ago at one of my friends house there was a bunch of vacuum tubes lying on the ground but at the time i didn't know what they were and they looked pretty worn out and old possibly even blown

they were actually small in size and not that big really.. not bigger than the palm of my hand but close

if someone could show me an extremely detailed but easy to read and understand description and possibly a video of how a tube amp or vacuum tube works and what's inside of it and which wire is where and goes where i would be really happy

by the way i do N.O.T want a guitar amp i want an audio amp for signals from something like a headphone jack of a computer.

i'm not exactly sure if i want to try making an amplifier just yet... but i want to learn more about how vacuum tubes work or tube amps
(which one is it in terms of audio? o.O)

sorry for really long post i try to show the details of what i want to find out about tube amps or vacuum tubes
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Old 19th September 2012, 05:54 AM   #2
opa1 is offline opa1  United States
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Go here. Top of page.
Click the image to open in full size. Click the image to open in full size. Sticky: On Line Tube Learning for newbies....
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Old 19th September 2012, 06:17 AM   #3
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Start here,

vacuum tube theory - Google Search

Lots of great info!!!

jer
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Old 19th September 2012, 07:41 AM   #4
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Quote:
i am terribly horrible at reading drawings of diagrams of things like this.
It's just a question of familiarity, IMO. Once you get more used to it you will gain confidence. We've all been where you're at.
Quote:
i could try a vacuum tube amp instead because it makes a little more sense to me than the transistor amps
hehe You're certainly not alone around here with that sentiment.
At its simplest, a tube has a negative cathode that emits electrons (usually by heating the cathode, called "thermionic emission") through the vacuum to the positive anode. A grid placed between the anode and cathode can be biased (ie a control voltage) to allow more or less of those electrons to complete the path.
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Old 19th September 2012, 08:03 AM   #5
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After reading all the above, try this:-

Three Watt Economcal Stereophonic Amplifier

A very simple Audio Valve Amp. One Valve (plus one for the supply if you want to go for Valve PSU rather than Semiconductor) which does both pre and power amplifying in the one glass bottle.

With a little modification, you could use the PCL86 (if you have access to Valves from old TV's then this was a popular Audio Stage Valve in TV receivers) instead of the ECL86.

Cheers,

James.
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Old 19th September 2012, 04:46 PM   #6
M Gregg is offline M Gregg  United Kingdom
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Journey to the Center of a Tube - YouTube

Quite interesting..it has been posted before..


Regards
M. Gregg
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Old 19th September 2012, 05:45 PM   #7
TheGimp is offline TheGimp  United States
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percival007, The PCL86 would be a good idea.

As expensive and rare as the ECL86 is, I would not recommend using it.

It would be very easy to convert that circuit to say an ECL82/6BM8 or ECL84/6DX8 (worse distortion).
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Old 19th September 2012, 09:03 PM   #8
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wow those diagrams are a huge mess of scribbled uselessness to me i can't understand or even read a thing of what it says
i can barely manage a simple diagram of a few diodes and a capacitor
so that's just impossible for me O_o
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Old 19th September 2012, 09:17 PM   #9
Pano is offline Pano  United States
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Tubes are like valves, hey! many people call them valves.
Imagine a pipe with water flowing thru them. Imagine a valve in that pipe. The valve is normally open, but if you pull the lever, it closes. The flow stops. Ease up on the lever and flow begins again. Simple. The pipes are wires, the water electricity.

Do that lever trick real fast and you'll get a sort of vibration or oscillation going in the water flow. More, less, more, less, more, less. You could hook that up to a diaphragm (a speaker) and get some noise out of it.

That's how tubes work, and why they call them valves in the U.K.
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Old 19th September 2012, 09:21 PM   #10
DF96 is offline DF96  England
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You can't learn even the basics of a whole area of applied science in a few hours. Allow yourself more time and take things more slowly. Start from where you are. If that is batteries, bulbs and switches then that is where to start. If you already understand that then the next step is Ohm's Law. After that comes AC, capacitors etc.
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