From Martyn, G8FEK ...
In 2011 we introduced the first low priced precision calibrated noise sources available in the market, enabling enthusiasts to carry out accurate noise figure measurements at significantly lower cost than previously possible. With product shipped now in 4 figures, I'm proud of our reputation earned by supplying quality instruments and support, to both enthusiast and professional users.
Today we are more passionate than ever to market and support instruments in this interesting area, helping folks tackle noise figure measurements, often for the first time. To all customers old and new, thank you for your interest in our products! ... 73 de Martyn G8FEK
A note on the graphic from RF Design magazine ... the reference to 'Classic' being an expensive word dates this magazine entry to 1990-92. This is a reference to the transportable Apple Macintosh 'Classic' (replacement for the 'SE'), my first Mac in 1990 with 2MB RAM!