Interestingly, I have just had a similar issue connecting a Revox B215 cassette deck to the AV DIN in/out on my Supernait 3 using a 4x RCA phono to 5 pin DIN.
I called Naim support and he suggested it might have something to do with the earthing arrangement of the Revox. The Revox’s mains socket is two pin.
I then tried the Revox B77 followed by my Nak 680 and both were fine: no hum, so in this case the Revox cassette deck was the guilty party. It’s now talking nicely to the Marantz 2275 in the other system.
I’ve used plenty of different recorders with my Naim systems - most of the recorders float the earth, some are battery operated, but have never had this issue.
Are you using either the Naim or the Chord 4 x RCA Phono to DIN5 interconnect, or something else?
Hi Richard, I’m using one I bought from Custom Lynx on eBay. It seems to be pretty decent quality. I think that because it’s fine with the Revox B77 and the Nak deck (which remains hooked up to the SN3), the problem is the earthing set up with the B215. At least it’s happy with the Marantz!
I’ve got a 100 resistive plug. Tried a few capacitance plugs. A little better but still not right
My turntable power supply has one earth lead to TT arm and one to back of Superline. I’ve tried a mix of a few combinations which altered the hum a little but not enough.
I just mentioned the cable as issues have come up before on some systems using the Witchhat 4–5 cable with hum.
One more thing which may be worth trying is powering the Superline from the Supercap socket 1 via a SNAIC5 rather than the Burndy and see how that goes (with Burndy link plug back in on Superline)
I’ve just tried powering the Superline from Supercap as you mention using a SNAIC5 (and still with Witchhat cable) and that’s sorted the hum. I wouldn’t say it was silent but not far off at 10 o’clock.
Must be the Naim Burndy which is almost brand new or some issues with the Superline
Interesting. It does point to an issue with the Superline when powered via the Burndy, particularly as you’ve tried both Supercaps. Might be worth seeing if you can borrow another Superline and Burndy to try out. How old is the Superline ?
@Richard.Dane - I’m sure there was an issue with another Superline which was exhibiting some instability and oscillating when used with a Burndy. I think the factory had seen this before when you checked it out and it needed a bit of fine tuning ?
Yeah - Superline is 2018 which was bought used. I bought the Supercap and Burndy about 18 months ago to use with the Yamaha amp I had it the time. Worked fine then (Supercap used, Burndy brand new).
Superline worked fine when I got the 252 and 2nd Supercap. Weirdly only heard hum previously when the record outputs were unmuted - that’s now changed to the main inputs so something must have deteriorated.
I’ll try stripping down the system and re-build next week. If that doesn’t sort it I’ll have a chat with my dealer
Thanks - yeah, saw that thread. Think the resolution was a fix for the Superline. Not sure what exactly …. Mine is from the same year of production so might be a known issue