My_Ref Fremen Edition - Build thread and tutorial

I don't know why I pay attention to such details but somehow I d like to put better iec inlet...

In my experience, on the My_Ref C the change from a standard brass IEC inlet to a Furutech gold plated inlet made a not so subtle difference.

BTW on the FEs difference is less obvious.

Those chinese inlets you linked would be a nice value if they're really copper but often what they call copper is brass with high (?) copper content...

BTW prefer gold plated ones, they're usually warmer sounding.
 
Who's Ivan?

Vox links take me to advertising. It must be an Ebay ruse to get more revenue from their advertisers.

But I discovered with another poster's Ebay links that "open in a new tab" take me direct to the page with the offer details.
I suspect "open in a new window" will also miss out the advertising re-direct.
 
Do Ebay ever offer products that infringe copyright or Intellectual Property rights?

If so, then our rule enforcers should be considering whether their directive to stop posting all links to any site that include infringement be extended to include Ebay and whether the penalties that were threatened should also be applied to posters of such links.
 
Just made a quick test

among a plain IEC inlet, Furutech IEC inlet and Furutech FI-03 (G) inlet with the FEs.

The difference is still present and Furutech parts sound better than the plain brass IEC inlet.

From the same seller you linked (vickylaw19)http://myworld.ebay.it/vickylaw19/?_trksid=p4340.l2559, since I've had good result with Sonar brand in the past, I've just bought the one which seem identical to the FI-03... I'll report back.

DISCLAIMER

Those parts are extreme optimizations with subtle improvements, don't buy them unless you have first optimized greater return parts, like passive components on modules or input and output connectors.
 
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Clave,
are you saying that the increased source impedance before the isolating transformer is being heard as an audible change in the music?
Really, that brass instead of copper in the Mains input socket adds that much increased impedance?
Or is there some other change that you have incorporated that could account for the sound quality difference?
 
Sorry guys I did not know such problem exist with links...

Regarding IEC and else- I am building an amp and getting better as better component as I can afford with one rule: mains wiring and everything involving high voltage is going to be fixed outright with no fiddling later. This is why I can get better IEC now and ordinary rca's and upgrade them later.
I don't want to play with high voltage until I am fully aware I am doing it right 🙂

P.S. My name is Ivan (not Terrible)
 
I left my print outs of grounding and wiring of interconnects at work, so some questions to follow this week.
But I have noticed trend- placing traffos in front , using extension rods for volume or switch to the back and pcb's at the back as well...
 
are you saying that the increased source impedance before the isolating transformer is being heard as an audible change in the music?

Hi Andrew,

I don't know if it's the impedance diff that makes the difference but a (subtle) sound difference among these connectors exists to my ears.

In fact the Furutech's contacts are also a copper alloy, not pure copper.

Maybe the main difference is the gold plating (Furutechs are gold plated, the plain one not).


Or is there some other change that you have incorporated that could account for the sound quality difference?

I don't think so... all three inlets have been cleaned with deox-it (to rule out oxidation) and fastons and cable were in common (I've swapped only the inlets).

Also comparison have been repeated three times so I don't think there's any effect due to 'scraping' oxide from connectors.
 
I left my print outs of grounding and wiring of interconnects at work, so some questions to follow this week.
But I have noticed trend- placing traffos in front , using extension rods for volume or switch to the back and pcb's at the back as well...

I think the rule of thumb is to keep the transformer as far away from the signal components as possible and within reason. That makes the mains power-in wires longer but twisting them all but eliminates any interference. The extension rods are used to facilitate short wires from pot to board. If you use a LDR based volume control that is not an issue.
 
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Hey!

today i just finished soldering the boards.
since 2hours i am hearing Norah Jones, the sound is FANTASTIC and the bass awfull.
i never thought a chipamp could sound so brilliant.
Speakers 2way selfmade 92db
Preamp emotiva umc-200

Thank you Dario