> I picked up what I believe is an older 230v G6 frame. The NT12
> PSU says "REV 2" on it.
>
> I noticed the PSU hums slightly. Though I also noticed one of my other G6

frames sounds

> about the same. But a third NT12 frame I have is quieter. So I just

thought I'd ask if it's a

> concern.

The transformers used in the NT12 sometimes generated a slight (mechanical)
hum noise. Normally the problem can be solved by replacing the transformer.
It is still available as a spare part. Please contact the Doepfer
representative in your country.

> The other thing I noticed was the plug socket has no hardware for a fuse.

Is that the way

> older units were made or is it someones replacement

We never offered frames without fuse. Maybe it's a DIY case. There first
series of frames (before 2000) were eqipped with another type of mains inlet
and had separate mains switch (not integrated into the mains inlet). But
even for these frames the fuse is located in the mains inlet.

Best wishes
Dieter Doepfer