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I honestly don't know why anyone would bother. They're widely available and cheap, and they last a long time.
You can do it two ways, as a complete drop in or wire in diodes beneath the socket and disable the tube except for the filament. With a drop in you'll have to get your filament resistors right in order to not throw off the others. Either way you'll need dropping resistors or bucking zeners to lower B+.
There are also those (I'm not one of them) who like to delay B+ and say that a SS rectifier will cause cathode stripping of power tubes during cold start.
John
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