Re: SW Death Star Blooming

I checked the B+ while the DS explodes and it drops 30v for a second then
recovers.

----- Original Message -----
From: "Mark Shostak" <xx.vl@cinelabs.com>
To: <vectorlist@vectorlist.org>
Sent: Wednesday, March 29, 2006 1:44 PM
Subject: Re: VECTOR: SW Death Star Blooming

> On Wed, Mar 29, 2006 at 07:09:30AM -0500, Christopher X. Candreva wrote:
>> On Wed, 29 Mar 2006, simon wrote:
>>
>> > I noted the other day that as on most vector monitors during the death
>> > star explosion some blooming is noticeable. I have heard that this was
>> > intentional, I find this hard to believe. I just rigged up my HV probe
>> > on
>> > my SW so that I could read the EHT during game play. it was rock steady
>> > at
>> > 19.5KV until the explosion...it dropped by 4kv!! I thought as much.
>> > This
>> > must be due to the amount of white screen. Can someone else check their
>>
>> Actually as I recall, this was on purpose. In the death start explosion
>> the
>> HV is lowered to defocus the display, to add to the explosion effect.
>>
>> Now this could be a case of saying "It's not a bug, it's a feature !".
>
> For those who weren't around, or forgot, here are Jed's comments on the
> topic:
>
> In order to have the Death Star explode the way we wanted it to, it wasn't
> enough to draw lots of concentric circles. We wanted to defocus the beam
> to fill it in. We briefly considered adding a vacuum tube to the monitor
> to control the Focus Voltage. Fortunately, the lead time for the part was
> too long. So what I did was to give the Vector Generator the ability to
> overdrive the monitor's color inputs. Overdriving the inputs causes the
> CRT to draw more current than it normally uses and drags down the High
> Voltage., which changes the normal ratio of Focus Grid voltage to Anode
> voltage, which defocuses the beam. This relationship is explained in The
> Secret Life of XY Monitors.
>
> The entire text is here: http://www.jmargolin.com/vgens/vgens.htm#Star
>
> -Mark
>
>
>
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Received on Thu Mar 30 04:34:43 2006