Never put WD40 in electronics, cameras or firearms (or really anything you care about). Never ever. If your problem occurs in both channels, it's caused by something common to both channels - so not caused by anything in either individual channel. That leaves power supplies and grounding, and you'll want to look in those places.
All good fortune,
Chris
All good fortune,
Chris
I made video with the sound on an I-Phone but it's in .mov format and will not allow me to upload. I have tried using my computer microphone but that has not been successful.
I never heard this kind of sound before, but if I had to guess, then it would be an arc. You have some more eliminating to do.
The fact that plugging the preamp into another socket reduces the problem would also have me inspect the house's wiring. Perhaps there's a loose connection in a socket or junction box somewhere.
The fact that plugging the preamp into another socket reduces the problem would also have me inspect the house's wiring. Perhaps there's a loose connection in a socket or junction box somewhere.
Well I've just been around to a friends house with the phono preamp and it is quiet! No crackles no pops.
So my power supply is the fault. Now to track that down.
Would I be right in assuming that the problem is minor as there is no interference with cd's or digital audio plus the fact that a phono preamp has to magnify a small voltage input?
Would a power filter or conditioner solve this?
So my power supply is the fault. Now to track that down.
Would I be right in assuming that the problem is minor as there is no interference with cd's or digital audio plus the fact that a phono preamp has to magnify a small voltage input?
Would a power filter or conditioner solve this?
I would investigate the source of the noise. A loose or arcing connection somewhere isn't going to get any better. How about having your amps powered up and then shutting off other breakers one at a time to see if the noise stops? That would at least narrow down the circuit.
If the cause is indeed an arc, a power filter isn't going to solve the problem.
A bad connection in the house wiring could potentially become dangerous (overheating and fire), so I strongly suggest you try to find out if you indeed have an arc fault in the wiring. Astouffer's suggestion is a good idea. Once you find the place where the amp has the most interference I would then switch off that circuit for safety first ( ⚠️ check if it is really switched off with a voltmeter⚠️) and start disassembling sockets. If you're lucky, a loose connection might be in one of those. But it may also be in a junction box which may be harder to find and access. If in doubt, hire an electrician.
I had a feeling. At least you are now looking for the problem in the right place.
Pete