Steven Marks Tube Power Supply

[ronotte]

Hi Bep,

nice to hear from you again. About that value (22 kHz) I am not so sure it was the last one found (I am going to re-check my own lenghty documentation)...anyway I do remember that I did an 'inverse' evaluation. I mean that I found the natural 'resonance' of the coil and than...as it was too much high I just resonate it lower by adding a parallel tank cap (...just like dfro suggested!). But I do remember as well that the most important effect found was the use of first & second harmonics that being developed from asyncrhonous sources did indeed auto-align with also the 3rd freq and then sum-up producing in output that beatiful '3 Sisters' almost sinusoidal waveform with lot of power available.

Roberto

[BEP]

Yes.

The important part for me was realizing we should avoid generating harmonics from each source but have them appear as 'near' harmonics to each other.

And the understanding that magneto acoustic effect does not need to come from a ferrous like core. Having a magnetic field from a conductor can produce the same effects as a ferrous core - only more interesting, faster, and movable.

Hoping to be back at the bench this weekend after a very long trip!

BEP

[otto]

Hello all,

the last few days I was working on a tube power supply like SM told us. Its fine working, bla,bla.... not to bother you.

In short:

when the power supply is switched off I see the electrolytic cap slowly discharging to 0V. Slowly because I dont use a bleeder resistor.

But!!

When the cap is totally discharged it starts again to charge!

So I diconnected to 230V from the wall. Still charging. I disconnected the oscillators. Still charging.

Then I took only the 5U4 tube and connected this cap to the tube and to the ground. No meters, nothing. Just the 5U4 + my cap. This was one of the reasons I bought this tube because the same happens with my EZ 81 tube.

After 20 hours I measured 10V on the electrolytic cap.

The setup is something like in the Tesla patent .....with the copper plate in the air.

Yeees, I know an antenna......

No wonder SM was working for years on the TPU. Im somehow sure he saw a lot more but Im not long working with tubes.

Otto

[AhuraMazda]

Thank you Otto. Does this mean your work with tubes is now concluded?

[otto]

Hello all,

@AM

this means that I want to continue in my work with tubes. You cant imagine how weird they work.

A time ago I wrote a friend that nobody knows how tubes CAN work. Im sure SM saw also what Im now exploring. And I know that a lot of surprises are waiting for me.

Is this somehow useful for my TPU work? I think yes. Maybe I have "discovered" a new core material. Who knows??

Now dont think I would stop the work on my TPU and waste my time with .... something that has nothing to do with a TPU. First the TPU and then ...

Now I have to wait again for my next 5U4 tube. A month or so.

Otto