[johnsingleton]

Hi Ian.

Thanks for the info mate.

My AVO works brilliantly and I use it as a demo machine for the RNZAF students I teach.
It's a shame that I only have a brown leather case for it - I remember the green ones from my early days in the RAF and even in the '90s when I worked on the T91 radar at Staxton Wold.
I'm beginning to think that the AVO's here were provided as test equipment for the BAC Strikemasters and Hawker Siddeley HS 780 Andovers that the RNZAF used to fly. A guy I work with used to calibrate them many years ago.
****** hell, I feel old now!!!

Thanks again for the info, stay safe.

John