Re: Tube regulator for removing ripple . . .

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>


What you're thinking about, then, is a cathode or emitter follower type 
circuit?  I'd go for the solid state approach (no hassles with filament 
power which would need to be floated at HV).  Or, can you put a series 
regulator in the low side?

An NPN follower using a reasonably HV transistor might do nicely.  What 
sort of power (current) are you talking about... if you're looking at an 
amp with 100V ripple, that pass device is going to be dissipating on the 
order of 100W.

The other reason that a tube might be a good choice and worth the hassles 
of isolated filament power is in the event of an output short, the entire 
4kV is going to appear across the pass device.

What about a shunt regulator?

What about a series inductive choke in your filter, rather than a straight 
capacitor filter?


At 12:23 PM 4/1/2003 -0700, you wrote:
>Original poster: "Mccauley, Daniel H by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
>
>
>I'm currently building a 4kV DC supply for my VTTC which will be used for a
>high-quality plasma speaker.  The only problem is removing the ripple on the
>output of my full-wave rectifier to the point where the DC is very clean
>(<10V ripple) Sure, this can be done with a boatload of capacitance but i'd
>rather go about it with some type of floating linear-type tube regulator.
>With 10-20uF capacitance I basically still have about 50-100V ripple
>depending on load.  I used both solid state and tube regulators for doing
>this same thing on a very large scale but never on a small scale such as
>this.  Solid state would be nice but it is quite complex to get working
>correctly and relatively expensive.  On the otherhand, maybe a simple tube
>driven regulator my be a simple, inexpensive alternative.
>
>Any one have experience with this and know of some small power tubes that
>can do this???
>
>Thanks
>
>The Captain