Yes, I knew it should be 65 but as johnsonwu said, the 6550 will last longer if set lower. That is also why the technican set them to 55mv.
ARC vt100mkiii Questions?
I brought one of these 2ndhand lately. The amp had both side boards inside replaced and only the transformers were old. So, it is not broken in. Well, I would like to get advice from other owners about its bass responds. It seems on some music esp. acoustic double bass, the bass is a bit soft and undefined but on others like big symphonies, it sounds quite right with good dynamics. But overall, the bass is not as tight as I would thought it is. I use JBL4425 and Haarbeths HL_5S so to think it is not the speaker’s faults. Does yours have very tight bass? What bias settings were yours set to, mine is set to 60. Thanks.