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Old 1st May 2001, 09:05 PM   #1
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Join Date: May 2001
Location: London UK
Can anyone explain why Accuphase (P100 Amp) connects neutral phase to power transformer via a rectifier (SEEMS TO BE) bridge with plus and minus out shorted and ac terminals across neutral and transformer bypassed by a 10 Ohm resistor? This raises the input impedance and creates a 0.8 V rms tophat shaped voltage drop across the mains terminals. Puzzles me!

I intend to take this out when I am able to understand why this arragement is used.
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Old 2nd May 2001, 01:34 AM   #2
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Here in the US, neutral is a term that refers to the grounded side of a 120VAC line. I believe that you're using 220VAC over there. 220V here is two lives and a ground (no 'neutral' per se), so I'm not clear as to what you're referring to when you say neutral. In other words, we may have a bit of a terminology problem here.
Is there any chance that you can post a schematic?

Grey
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Old 2nd May 2001, 04:16 AM   #3
grataku is offline grataku  United States
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Fmak
I don't have a CLUE of what's going on with your Accuphase (that wouldn't be the first time). I need a schematic too.

Grey,
in Europe the tri-phase is three conductors at 380V so the phase-neutral is 380/sqrt(3)=220V.
So it's the same deal over there like you have here, just a little different.
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Old 2nd May 2001, 09:35 AM   #4
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Default Mains Connection to Amplifier

Fmak,

It looks like an earth loop breaker. You can find more about that circuit on Elliot Sound Product's web page:\
http://sound.au.com/earthing.htm (Figure 3)
BTW, the whole site is packed with excellent stuff!!

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Old 2nd May 2001, 11:59 PM   #5
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Join Date: Feb 2001
Location: Columbia, SC
fmak,
If what you've got is what's shown on the ESP site, I'd say it's safe to remove it. I'd say to bypass it first. If you develop a ground loop, then hook it back in. Otherwise, go for it.
Incidentally, I'd be curious to know if you notice a sound quality difference with/without it...

Grey
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