Does anyone here know the PTT keying circuitry for this amp? I just need to know whether it keys the relays directly to ground or whether there is a keying transistor involved. Thanks very much. 73 Dick, K5AND No virus found in this outgoing message. Checked by AVG. Version: 7.5.516 / Virus Database: 269.21.6/1318 - Release Date: 3/7/2008 2:01 PM