Hi, I need to re-valve my Icon Audio stereo 60.1 and like the sound of 6550 but not heard of Harma sold by Watford Valves can anyone give me some info ie; quality ,sound, and long life /or breakdown issues. I've had Tung Sols in it before and quite like them because I found them musical with good bottom end but fancy a change any info would be a big help.
Thanks in advance
Tim