Mains Connection to Amplifier - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 1st May 2001, 09:05 PM   #1
diyAudio Member
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.
  Reply With Quote
Old 2nd May 2001, 01:34 AM   #2
diyAudio Member
Join Date: Feb 2001
Location: Columbia, SC
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?

  Reply With Quote
Old 2nd May 2001, 04:16 AM   #3
grataku is offline grataku  United States
diyAudio Member
Join Date: Dec 2000
Location: -
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.

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.
  Reply With Quote
Old 2nd May 2001, 09:35 AM   #4
diyAudio Member
Join Date: May 2001
Default Mains Connection to Amplifier


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

  Reply With Quote
Old 2nd May 2001, 11:59 PM   #5
diyAudio Member
Join Date: Feb 2001
Location: Columbia, SC
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...

  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Super Triode Connection Amplifier Build with 6BM8 and 6AK5 DerFly Tubes / Valves 35 3rd November 2009 07:45 AM
MAINS... simple, old style amplifier, plugged into mains electrical outlet (110) destroyer X Solid State 2 15th June 2008 02:31 PM
Class D amplifier? mains powered? ThyDntWntMusic Solid State 2 3rd February 2008 08:40 AM
Best possible connection between computer and amplifier? Need help! Erik Johansson Everything Else 7 28th April 2004 01:32 PM

New To Site? Need Help?

All times are GMT. The time now is 11:41 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2