Yup, I am having the same problem.
I recently fitted a gator board and thats when I started hearing the noise. I'd describe it as a low volume mid/high frequency "whistle".
It wasn't there with the passive mod, only with the Gator in place.
My Murata's are from the original batch of mods. Stan reckoned it was probably switching noise from teh Murata's, the noise i'm hearing being "switching noise" from the regulators.
Most folk get their Gator's to play nice with the Murata's, so maybe its system dependant? Not sure how though but its maybe a possibility.
I read here that a couple of guys had the problem and solved it by hooking up an extra cap somewhere near the Murata.
Cant remember the details sorry! Would be good if one of those guys pitched up?
If its switching noise...the solution might be to get a non switching regulator.
as someone said though..they are pretty pricey...
Glad its not just me thats having this problem!
*EDIT*
any chance it could be power supply dependant?
I shortened the cable on my Maplins CB Radio linear supply and Im pretty sure the noise is even louder??
odd...
Last edited by Gazjam; 08-05-2011 at 17:27.
AC POWER
Hardwired 10kVA balanced mains powering entire system
AMPS
Meridian 557 power Amp (Modded) / PS Audio BHK Preamp (Modded)
SPEAKERS
Wharfedale Evo 4.4
DAC
PS Audio Directstream (Modded)
TURNTABLE
Pro-Ject X8 balanced output via XLR / Ortofon Quintet Blue cartridge
PHONOSTAGE
Pro-Ject DS3 B balanced Input (TT and Phonostage powered by Pro-Ject Power box RS2 linear psu)
DIGITAL
CD PLAYBACK - Shanling ET3 CD Transport over i2s to Dac + MOVIE PLAYBACK Oppo 203 (Modded: Linear PSU, i2s output to Dac)
Tweaked AP-Linux based Roon Server into Oppo 203 as Roon endpoint
Ipad Roon Remote.
Apple Music/ YouTube via AppleTV, fed to Shanling via Airplay 1 (losslessly) and onwards to Dac via Wireworld Silver Electra 7 i2s HDMI cable
SPEAKER CABLES
Biwired: Duelund DCA10GA (Bass) Duelund DCA16GA (mid & treble) Duelund 12DCA used as jumpers (On "Blackcat Cable" Chris Sommivigo's advice - Yup, it sounds better)
INTERCONNECTS
All Balanced: Ghost+ recording studio XLR cables