FYI, just in case you don't know, there are 3 versions of the SR-400.
SR-400 Cyclone
SR-400 Cyclone II
SR-400A Cyclone III
The SR-400 Cyclone II is the most reliable of the three. The Cyclone II was designed by the Hallicrafters engineer who designed the Cyclone. The Cyclone III was designed by a collection of engineers from Northrup, Wilcox and Hallicrafters.