Silicon rectifier diodes (1N4007) work very well. Pete, wa2cwa http://www.manualman.com On Sun, 7 Nov 2010 07:13:04 -0600 "Ken" <n5cm at rtconline.com> writes: > Fellows, > > I need recommented solid state replacements for the 5U4 and 6X4 > tubes. Thanks, > > Ken N5CM