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Re: Tubes + SCR's has no class!
Hey Robert, Tuber's,
I must agree with you to the point of posterity, But Those darn dudes keep
out bidd'in me on e-bay for tho's Thyrotron's!!!!
In reality, I have had good luck with a 20 amp 400 volt SCR (the Whimps
they are!!!) in Staccato mode with several (2) 833's...
Guy's: Just get your feet wet! Don't be a whimp!
Back to tubes: I do think the H2 Thyratrons have some interests, only "I"
seem to have a problem getting one, BOOHOO!
Don't be afraid of bustin' tho's tubes Dave
At 09:20 PM 9/2/00, you wrote:
>Original poster: "Area31 Research Facility" <rwstephens-at-hurontario-dot-net>
>I just read..."An SCR can act as a switch to ground the cathode of the tube,
>thereby turning the oscillator on. They are the preferred device for doing
>this" ?!!!! Sure this might work but it surely is sacrilegious no?
>Wouldn't it be 'more proper' to keep it all half a century old technology and
>all tubes by going to a mercury or gas thyratron tube between the oscillator
>tube cathode and the system ground. Forget the modern SCR. If you think an
>looks more macho than a cold bank of power mosfets, you're gonna absolutely
>love a big thyratron tube plugged in next to it!
>I've experimented along this vein and found the mercury thyratron to be
>extremely easy to implement and trigger, not to mention indestructible.
>You don't need a large one either. One smaller one I tried was the same
>envelope size and shape as an 807 and worked well on the bottom of four
>Robert W."You can have my tubes when you can pry them from my cold dead
>AREA31 Research Facility
> > ----- Original Message -----
> > From: <mailto:tesla-at-pupman-dot-com>Tesla list
> > To: <mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com
> > Sent: Saturday, September 02, 2000 21:42
> > Subject: Re: More tube coil stuff (Carl Willis)...
> > Original poster: <mailto:cwillis-at-guilford.edu>cwillis-at-guilford.edu
> > An SCR can act as a switch to ground the cathode of the tube, thereby
> > the tube oscillator on. They are the preferred device for doing this, from
> > what I have heard. (In Staccato mode, the oscillator is pulsed every few
> > cycles to keep duty cycle low.) What is needed is an SCR that can handle
> > about
> > 20 - 40 amps and 600 volts...that kind of fat. (I don't understand why
> > don't need to stand up to the full plate potential, since it seems to
> me that
> > the floating cathode would lose electrons to the plate until it was at the
> > same
> > voltage. Can someone explain?) This kind of part is usually a stud-mount
> > thing. I tried to order one a while back from a surplus joint, but first
> > they
> > wanted $17 for it and secondly they didn't have it in stock. They're not
> > hard
> > to come by, I just don't feel right spending more for the SCR than I
> did for
> > my
> > tube (ten bucks).
> > >>>(One of these days I will get around to putting together a true staccato
> > >>>driver and I'll put a big fat SCR in the cathode lead for it.)
> > >I've got a big fat SCR....ideas?
> > Make a tube coil and use it for staccato. Or, give it to me!!
> > Christopher A. Boden Geek#1
> > President / C.E.O. / Alpha Geek
> > The Geek Group
> > <http://www.thegeekgroup-dot-org>www.thegeekgroup-dot-org
> > Because the Geek shall inherit the Earth!
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