Looking for reliable information regarding filament supply to amplifier tubes. What are the pros and cons for D.C or A.C volts. Thanks and 73s Eran 4X1MO No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.2/1270 - Release Date: 2/10/2008 12:21 PM