Valve (vacuum tube) help please

[Dezz101]

Hey I was just wanting to know, for something like a guitar amplifyer what is the inputted signal connected to on the valve (cathode, anode, filament or grid) and also what the outputed signal is connected to.

thanx

 

[Dezz101]

iM GUESSING THE INPUT IS THE GRID, AND THE OUTPUT IS THE CATHODE AND ANODE?

 

[dlgoff]

Here's a pic from http://en.wikipedia.org/wiki/Valve_amplifier" [Broken]

 

[turbo]

Think of an emitter (cathode) and a receptor (anode). This is a simple diode. If you put a grid between them (to make a simple triode) and hit it with an input signal, you can suppress or allow the flow of electrons from the cathode to the anode. Thus, a small input signal can be made to produce large variations in the output signal. The filament is a simple resistive heater that is used to warm to cathode so that electrons can be driven off it more easily.