20-08-2016, 10:46 PM
The Sinclair miniature MW receivers would all have worked with early Mullard OC xxM transistors, the gain in those examples does seem poor but then they have probably been knocking around for forty odd years, and no transistor of that vintage was great in that respect . The technology used in the metal alloy transistors was I believe developed by Philco in the US and for their time were a quantum leap in performance, some examples having ft sufficient to allow their use in vhf radio sets. Sir Clive did have a gift for talking up his products, and spoke of the mat transistors as if they were produced at his own premises. A couple of years ago I called in at J Birketts in Lincoln and was amused to see that they had packs of ten mixed types of mat's on sale for a pound.....
