AncientBrit wrote:How's the tube getter, still a good vacuum?
Yep, all silvery/black - if there be such a colour, not a hint of white anywhere.
I'll know in short order when the corrected metalwork arrives.
In the meantime the video opto-coupler appears OK. The slowest part is the photo-diode, otherwise it's basically flat to 10MHz...that's currently the highest sine-wave I can produce here. The photo-diode gives up at around 6MHz at -3db-ish.
Harry, I need to find a source of orange cloured perspex for when I use the P7 variants. It'll bring back memories of when I worked at Decca Radar in the 70's...no frame stores then! Except that the CRTs used didn't have the blue flash associated with a P7 tube...no idea what phosphor they used...it was still orange though.
The attached photo shows an example that is due for a CRT change - note the burn in the centre - it takes a few years to get to this stage...
Steve A.