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RE: Building A VTTC, staccato pcb

Original poster: "Henry Hurrass" <Dr.Hankenstein@xxxxxxxxxxxxx>


I guess I forgot to mention that the ideal stacatto controller would not
only control the duty cycle, as I mentioned in my reply, but would also
have a rep-rate control...I just assumed this minor detail as

Dr. Hankenstein

> [Original Message]
> From: Tesla list <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Date: 8/24/2006 6:23:06 PM
> Subject: RE: Building A VTTC, staccato pcb
> Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
> Hello VTTC builders,
> A couple of years ago a silk screened staccato PCB was available. There
> be a few left out there floating around. They were very nicely made and
> bugs were mostly out. It was somewhat of an open, joint project, including
> FutureT (aol) check his home page. The maker is on my tongue tip, sorry.
> I was very easy to assemble.
> Jim Mora
> Long Streamers
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Wednesday, August 23, 2006 11:09 AM
> To: tesla@xxxxxxxxxx
> Subject: Re: Building A VTTC
> Original poster: Mddeming@xxxxxxx
> Hi Dr. H,
> The staccato contrrollerr must be more than just a pulse-width
> controller. PWCs cannot lower the frequency at which the pulses
> occur, only their width., ie you can't get 20 PPS from a 60 Hz source
> with just a pulse-width controller.
> While any tube can be operated far below its design parameters for
> longevity, some tubes are designed so that, when operating properly,
> they are  in the "glowing plate mode" without melting. When in doubt
> R.T.F.M.   (RCA TT-5)  ;^)
> 73s / 88s ???
> Matt D.
> In a message dated 8/23/06 9:01:20 A.M. Eastern Daylight Time,
> tesla@xxxxxxxxxx writes:
> Original poster: "Henry Hurrass" <Dr.Hankenstein@xxxxxxxxxxxxx>
> I think the whole idea of the staccato controller in the first place is to
> limit the "watts dissipation" that the plate really thinks it's seeing. As
> an example, if you limit the duty cycle to say 50%, you could conceivably
> double the plate dissipation (thus producing a longer spark), but the
> "average plate dissipation" would still be below the "max plate
> dissipation" allowed for the tube. I.E.: 500W times 50% duty cycle equals
> 250W avg. = longer spark. Without the staccato controller (which is really
> only a pulse width or duty cycle controller AKA: CW Mode) the plate would
> normally melt. I personally do not like to see plates glowing any color
> other than black for longevity of the tube. Who cares what the BBS rate is
> as long as you find the sweet spot where you would back-off the duty cycle
> to make your coil a long time AND a long spark performer. Look at the
> plate: If it's glowing, you are probably giving too much "hammer".  enjoy
> and BTW nice work!
> regards,
> Dr. Hankenstein