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If you can afford it, then the Harbeth P3ESR are as good as it gets. I have found that if you need to turn the volume down, then just move closer to the speakers. They are phenominal from about 2ft...

What is your price range?

I think switching off my SMPSs alone got me about 40% of the way to a full solution in all aspects. Bear in mind that about 10 to 15 of my SMPSs are built into essential kit that I didn't turn off...

Have posted a bit of a review here.
https://theartofsound.net/forum/showthread.php?77316-Puritan-PSM-156

This is a mains purifier.

One of its claims (supported elsewhere on the Internet) is the removal of DC offset. My mains has only 5mv DC offset so I cant make an informed comment.

Where I have...

OK

Looking most likely I have quite dirty mains, predominantly from upwards of twenty SMPS in my house and many others in my neighbours.

Over my Hi Fi lifetime I have tried all sorts of mains...

While fiddling about I decided to tighten the earth clamp from the meter to the gas pipe.

I loosened it first, squirted it with Deoxit, and retightened. This almost free tweek certainly took away...

OK, I'll throw it out there for more focussed debate.

Its a Threshold Audio S200 E/Stasis. Hugely rated at the time and remembered with nostalgia, but is there better to be bought at that price...

Love the sentiment, but its nearly £2K. Not a 'bit of cash' for me :)

What parts might you expect to have been replaced in that 40 years?

Yep, all Christmas stuff including tree and lights were off :)

OK

I have just turned off all the accessible SMPSs in the house (about 20). This includes such things as three Alexas, six phone chargers, iPad chargers, computer anxillaries etc. I doubt any...

I was thinking again about 'dirty' mains and remembered that most exhibitors at hi fi shows are concerned at the poor mains quality caused by hi fi kit in nearby rooms.

Equally turning off SMPSs...

Thanks Martin

Forgive me if I misunderstand, but I think you are saying that if you plug an SMPS alongside a bit of hi fi kit in a double mains socket it shouldn’t have any effect on the hi fi device. If this is...

I keep reading how household SMPSs corrupt the electrical mains and this can influence the SQ of Hi Fi systems.

I have just had a quick count up and my house has over 20 SMPS plugged into the...

Thanks

Decided to put it in a cupboard as a spare if things go wrong :)

Not much talk on here about Ifi DACs so we'll see. Its for my second system anyway.

Yes it does

Sorry Lawrence bit ambiguous. The noise was always on the same side irrespective of cable. ��

Thanks, and in a way I have taken on board both bits of advice.

I had stationed the DAC directly behind my amplifier and moving it as far away as the cables would allow, reduced the noise by about...

My Topping D30 DAC has a burbling type sound on one channel

Info
1. It increases in volume if the amp is turned up.
2. Swapping DAC to amp cables (L to R) makes no difference
3. If the digital...

Which part of the UK is he in?

I would like to see if we can assemble a comprehensive list of people that are able to fix or service Hi Fi gear. It would be great to cover the whole of the UK

Their area of expertise such as...

Thanks anyway Lawrence. :)