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[QUOTE="floppybootstomp, post: 14282533, member: 4"] Most diodes, unless they're something specific such as a Schottky type, are similar and all you should normally check is it's voltage and current ratings. Some are faster than others but this shouldn't normally be a problem if using a substitute. I'll stress this is partly guesswork on my part and when using diodes I usually use what's specced. It is uneconomic to buy small amounts of electronic parts from most suppliers but luckily for me I'm only a bus ride away from RS in Bermondsey. If need be I could collect an order for you and post it to you at cost. I also have here some large diodes and could post to you for postage cost only: IN4004 & one marked 261-211 RS which isn't a listed product at RS so it's probably very old but it looks to be the same size as the one you need so might be suitable. [/QUOTE]