The Agc on my 390-A doesn't work. Substituted V506, V508 and V509 with new tubes, no help. No agc voltage appears at TB102 3 and 4. Any thoughts on where to start? Thanks, Gene NA�G _________________________________________________________________ Is your PC infected? Get a FREE online computer virus scan from McAfee� Security. http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963