magnetic field when stacking

6 tesla

0

I like more Christopher's answer.... zero?

...Javi

The Cat is Dead.

Absolutely no idea but while you're at it measure it to the side of the box away from the circuit board as well. They were saying on my factory visit last week that the transformers are wound to be at their leakiest opposite the boards, this level of tweakery on Naims part may post date the Nait1 of course.

42

yeti42 posted:

Absolutely no idea but while you're at it measure it to the side of the box away from the circuit board as well. They were saying on my factory visit last week that the transformers are wound to be at their leakiest opposite the boards, this level of tweakery on Naims part may post date the Nait1 of course.

in the case of nait 1, its lower out the sides than out the top

Jon,
By definition, Tony has to be correct.  
The answer to life, the universe & everything is .... 42.

Hitchhiker's Guide to the galaxy said so.

Best regards, FT

Wasn't the Nait 1 designed as a lifestyle product back in the day to sit on a raffia mat on the sideboard ?

Put these between your Naim units and shelf and all magnetic field problems are gone.

Ah, but in what units...

I suggest 42μT (0.42gauss) as that's very approximately the strength of the Earth's magnetic field around here.  This may vary maybe as much as +-1μT at 50Hz due to the transformer (but I doubt it'll be anywhere near that amount).

i.e. the field strength is tiny.

Surely not long now til the big reveal.....

C.

15 milligauss directly on top of the nait1

The winner is... Huge!!! He suggested +-1 microTesla and it was 1.5 microTeslas!!!

I don't know how much is down to the transformer fields, how much to Burndys interacting with each other and other cables or the head units with each other but I'm getting some very noticable changes from swapping boxes around. Since the 500 turned up, left and came back again I think I've tried a fair few arrangements of the brawn stack. The spur for all this has been comparison with what the 250-2 did in the system compared to the 500. You'd think the 500, post service and DR, would slaughter the 250 in every respect but when it was away the 250 went in the bottom shelf of the brain stack since I couldn't be bothered rearranging the speaker leads. The boogie came back, was it really so lacking with the 500? The system at the time was brain frm the top: TT, CDX2, 552DR, Superline, 250. Brawn from the top: Tivo, NAD4020A, 555ps,space(absent 500ps), supercap, 552ps. I put it down to the age of the 500 (16 years) but when it came back, although better it still wasn't right and now its Burndys touched the carpet too after Naim had worked them.

There followed a series of box moves with each step an improvement. The 500ps went up a level, the 555ps down 2 and the supercap up 1. The 500s Burndys now hung free and no Burndy touched another or a Snaic or an interconnect, one of the DIN/canon cables rested on the carpet the other on the Fraim wood behind the glass but otherwise everything looked pretty good. The system still didn't boogie like it did with the 250 though it had improved. I tried swapping the 555ps and 552ps but the Burndys got in each others way so I swapped the 552 and CDX2, this put the bottom corner of the 552 level with the top corner of the 500ps. The boogie was back at 250 levels and I thought I'd cracked it but prolonged listening revealed a lack of sweetness to female vocale that I'd enjoyed in the past and the music wasn't flowing quite as well as it should. The Burndys of the 555ps and 552 ps were running parallel for about a foot though not quite touching so I tried swapping the 555 ps and 552 ps again, this time there was no Bundy collision. The 3rd dimension seemed to expand hugely and the boogie had improved again. This is the best I've had, ever, until the next time anyway.

So TT, 552, CDX2, SL, 500 on the left.  Tivo, NAD, 500ps, SC, 552ps, 555ps.

Swapping the SL and 500 would mean a Fraim rebuild so can wait.

Foot tapper posted:

Jon,
By definition, Tony has to be correct.  
The answer to life, the universe & everything is .... 42.

Hitchhiker's Guide to the galaxy said so.

Best regards, FT

This is a universally known fact, so no particular need to quote the source, although thanks for reminding us FT. 

I understand there's corroboration of this (42) on Wikipedia now.  ( https://en.m.wikipedia.org/wik..._Guide_to_the_Galaxy )

You just can't find a more comprehensive forum for digging deep into the science behind our 'hobby'.  I've never seen the Scottish forum address important matters like this, for example  (not that I visit the Scottish forum).

... for probably only the second time in my life ... I'm speechless ...

15 ... so what?

Well it's not a lot is it? Which suggests it's not electromagnetic interference between stacked items. 

hmm - this got me thinking... always a dangerous thing. Jon was talking magnetism and electromagnetic radiation  - and indeed the two are directly related to each other as long as they are not static but their effects very much vary on frequency. So at mains frequency of 50 Hz, electromagnetic radiation has a  wavelength of circa 6Mm (6 million metres) and the energy is approx 207feV... but you wind some noise onto the mains - say high frequency 30 Mhz noise the electromagnetic radiation wavelength then has  'shrunk' to 10m with a massively increased energy of  124neV ... so surely to measure the electromagnetic interference one would need to state the frequencies one is measuring for and the EMR or magnetism at that frequency. I would have also thought most sensors be quite different to be able to measure these two frequency/wavelngths - although I could be wrong - developments are abound in this area... so Jon out of interest what are you using  to measure the electromagnetic radiation from the transformers and over what wavelengths?

Simon

" that you should put...." or shouldn't put?  

This has got the makings of the damping factor 'debate' of a few weeks ago. I predict two and a half pages, minimum  :-)

Chris

Hhhhmmm, I wonder what a 52PS puts out of the top of the cover.  I wonder who might know?

actually having googled - I have seen lot of cheap little devices that can now measure from 50Hz to 2GHz EMR so it looks a lot easier and cheaper than it used to be - i might have to get one. Be interesting to see the EMR from so called noisy SMPS - as well as all my Naim boxes - and the difference in the EMR between display on or off

S

Having just invested the cost of a new 552 in a calibrated mains generator synthesiser from newtons4th in Leicester for my ukas lab it is going to be fascinating to see what happens under calibrated bad mains generation. 

Jon - what are using as EMF/EMR measurement tool?

Does the magnetic field make the music more 'alive' ?

Does the reading increase, when you play Jean Michel Jarre's 'Magnetic Fields' through the system ?

:-)