Go Back   Home > Forums > Amplifiers > Power Supplies

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
Reply
 
Thread Tools Search this Thread
Old 17th December 2006, 09:42 PM   #1
diyAudio Member
 
Join Date: Dec 2005
Location: Bologna
Default from 120V 50hz to 230v 50hz?

Hi, I want to buy an amplifier that is for american market and so it need different current voltage. Does it exist a current converter? Cheap? and after all it sound good as normal the amplifier?
thank you
  Reply With Quote
Old 17th December 2006, 09:53 PM   #2
diyAudio Member
 
Join Date: Apr 2004
Location: 12km off the alaska highway in northern BC
Quote:
and after all it sound good as normal the amplifier?
how can it, when even powercords are claimed to have a sound.
Otherwise, if the sound of transformers doesn't bother you - make sure you get a converter approbriate to the max. wattage used by the amp.


Check here:http://search.ebay.de/spannungswandl...sPageNameZWLRS
  Reply With Quote
Old 18th December 2006, 12:54 PM   #3
diyAudio Member
 
Join Date: Dec 2005
Location: Bologna
thank you

Quote:
how can it, when even powercords are claimed to have a sound.
No I'm not of that party. Infact I see that even audiophile brands such NAD or AMC use very normal and thick power cords.

Quote:
if the sound of transformers doesn't bother you
Do you mean the sound of the external transformer, right? because With all that energy there shouldn't be some fans?

On the spec sheet of the amp:
Power consumation 360W so what converter I need to have "full power" also at high volume? 360w is ok or I need some reserve?

thank you
  Reply With Quote
Old 18th December 2006, 01:58 PM   #4
diyAudio Member
 
Join Date: Sep 2004
Location: UK
Do a google search for "1000W autotransformer" which is all you need with a very large safety factor.

you should be able to source one for 100 or so, eg

http://www.henrys.co.uk/TEST/testequ...pricelist.html

An autotransfor is a lot cheaper since it only has one winding with taps on it (0-110v-120v-220v-240v etc)

So you would connect your (italian?) 230v between 0 and 230v, and the amplifer between 0 and 120v
  Reply With Quote
Old 18th December 2006, 03:42 PM   #5
diyAudio Member
 
Join Date: Dec 2005
Location: Bologna
Quote:
(italian?)
yeah
  Reply With Quote
Old 18th December 2006, 04:16 PM   #6
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
wait till you can get inside.
The transformer may have a dual primary that can be rewired to take various voltages from 110Vac upto 240Vac.

If the transformer has only a single low voltage primary, then you have a choice
1. change the transformer to a 230Vac version with all the correct secondary tappings and windings (could be expensive).
or
2. fit an external transformer to convert your 230Vac down to 110 or 120Vac to suit the maximum amplifier input power.

An autoformer is cheaper and technically just as good if you go for an external conversion.
An isolating transformer offers the advantage of isolating your amplifier from the mains and eliminates one of the routes for mains hum (earth loop). The portable 230Vac to 55-0-55Vac safety transformers used on building sites would give what you need and relatively cheaply (do you have these in Italy?).
__________________
regards Andrew T.
  Reply With Quote
Old 18th December 2006, 05:50 PM   #7
diyAudio Member
 
Join Date: Dec 2005
Location: Bologna
yes we have but they aren't so cheap.
Quote:
The transformer may have a dual primary that can be rewired to take various voltages from 110Vac upto 240Vac.
Explain me well, it's cheap and easy to do?

Quote:
An isolating transformer offers the advantage of isolating your amplifier from the mains and eliminates one of the routes for mains hum (earth loop).
If I don't use isolation transformer I get hum from my speaker or from something?
or it's just the normal noise on the current line that I get today? I hate hum

Quote:
The portable 230Vac to 55-0-55Vac safety transformers used on building sites would give what you need and relatively cheaply (do you have these in Italy?).
  Reply With Quote
Old 18th December 2006, 06:00 PM   #8
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
WAIT!!!!!!!!

Check inside and see if it is fitted with a dual primary transformer.

If it is then call back and we can explain the easy conversion.

(just hope it's not as confusing as a recent KRELL thread - they go out of their way to prevent conversion)
__________________
regards Andrew T.
  Reply With Quote
Old 18th December 2006, 06:07 PM   #9
diyAudio Member
 
Join Date: Dec 2005
Location: Bologna
Click the image to open in full size.
  Reply With Quote
Old 18th December 2006, 06:19 PM   #10
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Default Re: from 120V 50hz to 230v 50hz?

Quote:
Originally posted by testarossa2k @10.42 pm yesterday
.... I want to buy an amplifier that is for american market and so it need different current voltage....
and you have it open today!

I think I see four wires from the mains side.
This COULD be a dual primary transformer.
__________________
regards Andrew T.
  Reply With Quote

Reply


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
50Hz UPS xyz9915 Power Supplies 4 28th February 2009 08:04 PM
I have a 120v/50hz guitar amp and I need to know... sirzune Instruments and Amps 3 19th February 2009 01:32 AM
What's the "right way" to get Logitech Z680s running on 230v 50hz mains? xaphod Parts 4 11th December 2007 09:55 PM
cheap (230v 50hz) 160va 25+25 tranny on ebay guitar_joe Swap Meet 0 24th November 2007 10:53 PM
50Hz noise Dxvideo Chip Amps 3 1st December 2003 07:11 AM


New To Site? Need Help?

All times are GMT. The time now is 06:14 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2