Hi Bill, got to radio shack and get 4N32 they are the same as 4N33. The 4N33's are very hard to find I never found one. But the 4N32s work real well. Cost is about $1.25 each the last time I got any.. 73, de Ron K5DJ -- WWW: http://www.contesting.com/writelog Submissions: writelog@contesting.com Administrative requests: writelog-REQUEST@contesting.com Problems: owner-writelog@contesting.com