There are no resistors on R2 and R1 on my board. Which is the power and charging circuit. Are those optional? It's made by headnhifi.

I've bought a brand new O2 amp. It works fine when connected to a power source. But the batteries are not charging and therefore I can't use it without a power source. However the 9v batteries do work when I remove them and charge them in a separate battery charger unit I own - which is not...

49326 serial sticker is on the left side

Quote: Yes the one with the new straight plug.   Quote: Yes the low end is definitely not as clear. Its muddy. The highs seem not quite as "3D". I've burnt them in for nearly 100hrs and they're still not as good as the older pairs from 2006-07.

I think the newer KSC75 isn't as good as the older ones. I bought a newer pair this year with a slightly different cable and it just isn't quite as good a my older pair which I bough around 2007.

Thanks alot. Have you managed to test the ADC? I'd love to restore many of my old tape recordings.   Wish someone could do a comparison with 0404.

Is this better than the 0404 USB?

Just recently bought a refurb one but it had several issues and the audio inputs were all dodgy (broken). So I took it back. But I really really liked the sound quality of it. So I'm wondering whether I should take the risk of another 0404. Or try something else like the Echo Fire, the Saffire 6...