Tubes?

[Super God]

Yeah, this one is a dual triode so I figure 5 should be good for mine, I have nine controls instead of three.  So 1 tube for every 2 controls seems good.

[Super God]

Wait, how much voltage to you need to pulse the tube with in order to make it conduct?

[innovation_station]

hello all

in 1 of my last posts i said i was going to use tubes hummmmm


how am i going to use them  well i thought a tube freq generator and a tube amp has anyone seen the video from border land sciences i posted a link a while ago wich i saw in another thred it is how i would start using tubes in a tpu type setup i will look for the link and post it when i find it


ist

[BEP]

It would be agood idea to look up tube theory for those who don't know it.

They are virtually the same in function as transistors. There are some very useful differences.

Diodes/rectifiers use the same charts except they will conduct almost any current you apply at almost any level. There is a turn-on point but it can be extremely low. There is a reverse current stoppage also but in both cases there is virtually no wishy-washy turning off and on points
(noise/harmonic generation). You want fast - you got it! Think check vavle.

Gated tubes - triodes and other extensions with grids are analogous to water valves with knobs or transistors.

Basically a tube diode has a cathode and a plate (all have heaters). Think of the plate as the banded end of a 1n2004 and the cathode as the unbanded end.

A triode is the same as the diode but it also has a grid. Think of the grid as the base of a transistor, the cathode as the emitter and the plate as the collector. Tubes require little or no feedback to trigger the input - depends on circuit.

Tetrodes, pentodes, beam tubes, etc, etc, are all variations of the above.

The main difference is that on a SS circuit light comming from your board is a very bad thing. Light comming from a tube circuit is a good thing. There are limits in light and all the other things just like SS.

Another difference is that they are all mini-particle accelerators! If you want to use them as fast switches go for VHF/UHF class tubes. On there turn-on point they are simply ON.

I feel sorry for those who haven't used them. You think you've made smoke? No way! I've burned things down with them!

SM was completely right when he said something like start with tubes to figure it out - why? Because there are fewer extremely fine details to consider during design and they will only conduct what they are capable of. SS blows up instead. Fewer supporting parts also, when done right.

[Super God]

So if I applied a 12 volt DC current to the grid pin it would start conducting over the anode and cathode?  No resistor like a transistor would need?  If so then yeehaw.  I found one that looks good, it was designed for VHF/UHF!  So, I may have an easy time finding the right frequencies!  Yay.  It's two in one, too

Thanks!