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Originally Posted by af024
Interestingly, the aerial in my FB10 is not on a ferrite rod. It's just a large coil of wire (well two coils actually) wound round the back and supported on what looks like card. It looks like it’s built to cook over the heat from the valves! So, even more variations are coming to light. Regrettably there is no serial number on mine as the paper label is missing.
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That will be a frame aerial. Ferrite rods were just being introduced around that time - another mid-production design change by KB
Paul