Alek, What faults / problems did you find or hear about with the 728 ? 73 Adrian On 24/6/22 10:14, Alek Petkovic wrote: > And those FU728F tubes are junk. It is all but impossible to get a > good one these days. The supply has completely dried up. > > I would not touch an amplifier that uses that tube. > > 73, Alek, VK6APK > >