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It is possible (though not necessarily recommended) to replace the vacuum tube rectifiers in tube equipment with solid-state silicon diodes.



General Precautions for Siliconizing (not specific to Hammonds):

In fact, there are so many caveats that I always advise keeping the tube rectifier unless there is an absolutely compelling reason to change it. Whatever you do, build it on the base salvaged from a dead tube, so that it just plugs in. Then, when you have pangs of guilt over depriving your machine of its natural complement of tubes, you can just swap back, without having hacked up the chassis!



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