Jerry is right about silicon diodes. That's what I should have said, sorry. But I think germanium would not be good. TenTec doesn't use them in those places. Mike -- FAQ on WWW: http://www.contesting.com/tentecfaq.htm Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com Search: http://www.contesting.com/km9p/search.htm