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I have got an old HP-33E which doesn´t work as result of a problem in the power supply board.

I think a transistor is failing (there are four), but it is hard to get a replacement for these components.

May be somebody knows which transistor I can use.

Thanks in advance

Jon

I don't but Viktor knows how :

http://www.rskey.org/calckb.htm

HTH

Pyerre