Tubes?

[Mannix]

@All,

So in his first successful trials, we know Steven used 3 old tube type generators run through a tube amplifier.

Were these generators commercial units? Probably yes. If so, were they square wave  or sine wave generators? Perhaps they were Pulse Generators, as I believe there were a couple made in the tube days.

What kind of tube amplifier did he use? Was it a lab type, or consumer home units? Surely regardless of which, chances are pretty good they had an output transformer, which would limit the frequency response and "shape" of the pulses or square waves if that's what he was applying to the coils. There would likely be tons of overshooting and ringing.

It's quite possible Steven modified whatever amplifier he used to bypass the output transformer. This would eliminate the transformer induced problems.

These generators were also not likely synchronized, unless he specially designed something to accomplish this, but I highly doubt that.

What does that indicate to you about making catalyst?

Darren

old tube type generators means sine or smooth pulse...sine is the only way to achive harmonic perfection.

it might be interesting to search for old square wave generators...as far as i can tell they arent around.and the reference to them is vital.

I am really pleased that a few are going down  this path which at first seems backward.

I am optimistic that help may arrive as tube inertia is created here..feel welcome with your hot bottles here.

Darren, does orcad have 6as7g and 6bq7,5ar4

i have only a few tubes in the  multisim that i use ..perhaps i need to change my tool?



well done Marco

[z_p_e]

old tube type generators means sine or smooth pulse...sine is the only way to achive harmonic perfection.

it might be interesting to search for old square wave generators...as far as i can tell they arent around.and the reference to them is vital.

I am really pleased that a few are going down  this path which at first seems backward.

I am optimistic that help may arrive as tube inertia is created here..feel welcome with your hot bottles here.

Darren, does orcad have 6as7g and 6bq7,5ar4

i have only a few tubes in the  multisim that i use ..perhaps i need to change my tool?



well done Marco

Lindsay, you should know by now that I usually do my homework before I post something....well this time was no exception. I am already looking at designing my own tube gens, and have done quite a lot of digging.

"Old tube" does not mean sine only ...not at all!

Harmonic perfection can be achieved in at least two ways, depending on your perspective. Mine is different perhaps.

There are several tube generators doing more than just sine....here are the ones I've been researching:

HP202A
Sine / Square.
Uses tube Schmitt for oscillator.
.008 ~ 1.2 kHz

HP209A
Sine / Square.
Up to 2 MHz

HP211A
Square only.
Up to 1 MHz

HP212A
70ns Pulse Generator.
Uses Thyratron.
PRR up to 5 kHz only.

So you see, they were and are out there. And this is only Hewlette Packard!

I have models for all those tubes you listed. You can get many tube models on the web as well. PM or email me with your wishlist, and I'll see what I have.

I am however at the moment, checking the integrity of the 6BQ7A model I have. I want to make sure negative grid bias is modeled properly.

Cheers,
Darren

[Super God]

If we are going to make some test equipment, would it be possible to make it round?  Like the box all the compnents are in?  That way we can put it in the middle of the ring and tune it from there, less distance for the wires to travel, too.  My tube test circuit designs are all round in design so they fit right in the middle.  I was using the first device Steve made that was in the black tool box in one of the videos as a reference.

[z_p_e]

SG.

I think you missed the point.

One of the reasons for testing with tubes is so the controller doesn't have to be placed in the center of the toroid!.

Therefore, I see no need to design a tube generator that is round for this purpose.

Darren

[Super God]

Well, just because it's made of tubes does not mean it is unsuceptible to interference from the coils!