Peter, You might get by using a line matching transformer. You've got a high impedance mic, going into a low impedance input circuit. Line matching transformers are available at most places that sell microphones. Also, you might try using W2ENY? or something like that. Its advertized in QST and on the net. He sells pre-amp/equalizers in kit form that will do the same matching job plus much more. Particularly if its a broadcast mic, or said a better way, a full range mic, you can tailor it to the input to your voice characteristics. As for a preamp, you probably don't need one, since many of the old mics were fairly high output. Just try matching it up first. Oh, just remembered, Heil sells a transformer to go from a low mic to a high imp. input. Probably work in reverse as well. Its small enough to fit in a stand base...possibly. Good Luck David Wd9cmd ----- Original Message ----- From: Alterman, Peter (NIH/CIT) [E] To: [EMAIL PROTECTED] Sent: Tuesday, April 15, 2008 3:06 PM Subject: [drakelist] mic question
I've got an old mike ~100k ohms, want to use it on ricebox that's looking for 500-600 ohms. Anybody know of a kit/project I can work on to cram an appropriate preamp into the old mike's base? TIA, Peter W2CDO
