Heathkit IT-17 -- Need Parts--Help

[tlee]

Does anybody have an extra 57-27 rectifier for the IT-17 tube tester or is there a replacement for it??  It looks like an old selenium type and I am not sure I can replace it with a modern silicon diode(s)??  Can anybody give me  some info on this.  Any help appreciated   THanks  Ted N8GPQ

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