As I’ve seen it mentioned is I have never h few other threads but not as a separate topic I thought I’d ask.
I’ve never noticed any hum on the Naits, the 150 or the 250-2. The 250 CB I’ve just picked up does hum though, quite loudly through the speakers until I switch the hicap/pre on. The hum then completely disappears. Also there is no hum when I disconnect the source din input.
Why is this, and is it normal?
You should always switch the preamp on first, wait a little bit, then switch on the power amp. Turn the power amp off first, wait a little bit, then turn the preamp off. Problem solved.