To wrap this one up, I did refurb the bias circuit to MkII values, but boosted the output to 260V (original ~170V and MkII =230V). The headphones sound fine (more efficient), but still not what I was hoping for - not competitive with Focal Utopia, overall. I'll be writing up the details of the...

Hi! Thanks for the reply. I have since read a bit about bias recharge time and have given the phones more time and listened more. They don't have much bass, but pretty amazing highs. They are not how I remembered them, but still clearly have really special characteristics. Having now looked...

Hello! I am a new member, just getting back into headphones a bit, and well, you guys are the masters of these issues! I am the original owner of the 1975 Stax system in the topic title. It has been little used in decades - just sitting in a plastic bag in a cabinet. I need to get back into...