> This is the reflector http://www.ebay.co.uk/itm/120982253359 (all sold now).

Actually the seller relisted it and has four more now.  I had guessed you'd 
picked up the reflector from a flashgun, those are much nicer, and have the 
handy flat perimeter with mounting holes.

> The reflector makes the strobe!  I would not have proceeded with the build 
> until I had got the right one.  It is just perfect.

Indeed, an excellent find.  I totally understand that mindset too, æsthetics 
are important.

> All valve GPS Rx added to my to-do list.

Hee!

> But I think a crystal oscillator or mains frequency derived gate might be 
> easier for the Mk 1.  Perhaps a dekatron counter?

That's the spirit!  I still plan to breadboard some phantastron circuits and 
see if a) I can make them operate reasonably at megahertz frequencies, and b) 
if I can build a low power version with battery tubes.

I also wonder how fast I can drive one of those "crater" neon tubes - that 
might make an interesting high-frequency, low-brightness strobe.

- John

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