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Re: More tube coil stuff (Carl Willis)...

Don't think you need a really "FAT" SCR. Any 20 amp 400 Volt+ SCR should do 
the trick. $10 tube vs $2 SCR...

I can get 1000 Volt 500 amp (AMP!) SCR's (5 Volt trigger) for $10. Now I 
did toast one of tho's babies once , ;-)

Have fun and be safe,

David Trimmell

At 06:42 PM 9/2/00, you wrote:
>Original poster: cwillis-at-guilford.edu
>An SCR can act as a switch to ground the cathode of the tube, thereby turning
>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 
>20 - 40 amps and 600 volts...that kind of fat.  (I don't understand why they
>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 
>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
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