I have a first generation Braun Series 9 electric shaver (9090cc) which I have been using daily for the past 5 years. Years. The razor is great, but it came with a faulty 90 cartridge head (blue). Luckily mine didn't fail prematurely; it just broke recently. Braun did the smart thing by updating the Series 9 cartridge with an upgraded version of the 92 with titanium nitride gold plating. I can confirm that the 92 cartridge works great with the old 9090cc razor and works the same as the original 90 cartridge. So far I can recommend the Braun 92S cartridge for use with any 9 series shaver.
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