Hello Group: Has anyone experimented with using a resistor in place of the 3TF7? And what is the actual resistance of the 3TF7? Thanks! Bob W1CNY --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.377 / Virus Database: 211 - Release Date: 7/15/2002