:: There are four TO3 transistors marked SGS 108-055 I wonder if they are Darlington's? I have some circuits that have ancient transistors - OC71's anyone? Anyhow their part numbers begin with SGS followed by three digits. Colin -- cdb, colin@btech-online.co.uk on 12/21/2009 Web presence: www.btech-online.co.uk Hosted by: www.1and1.co.uk/?k_id=7988359 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist