Klipschfoot Posted March 13, 2005 Share Posted March 13, 2005 I brought home a nice receiver recently. But it uses 220 or 240 volts only. It also says "450 WATTS" on the back. Now I know that is not wpc so don't think I am THAT stupid. Step-up convertiers are cheap and I want to test this thing out. Will I need anything more than a 110v to 220v 50 watt converter? It's a Pioneer SX-850 European version with a detachable power cord. It may occupy my office soon. Quote Link to comment Share on other sites More sharing options...
Fish Posted March 13, 2005 Share Posted March 13, 2005 If the thing can suck 450 watts for 2 channels it at least has some power. Quote Link to comment Share on other sites More sharing options...
djk Posted March 14, 2005 Share Posted March 14, 2005 "If the thing can suck 450 watts for 2 channels it at least has some power." Not really. Audio equipment has a power factor of about 0.7, so only 300W of the 450W in is available for the amplifiers to use. A class AB amplifier is about 60% efficient, so you can get about 90W per channel at 4 ohms out of it. And that's what it is rated at. The gentleman will need a 500W step up transformer to use this device. Quote Link to comment Share on other sites More sharing options...
Fish Posted March 14, 2005 Share Posted March 14, 2005 I guess its all relative,I consider that "some power"not mega power. Quote Link to comment Share on other sites More sharing options...
Klipschfoot Posted March 14, 2005 Author Share Posted March 14, 2005 It's only rated @ 65wpc. That is a hefty input/output ratio. Is that due, in part, to or related to the 220v Euro standard? Maybe Max might be able to shed some light on this. Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted March 14, 2005 Share Posted March 14, 2005 You are going to need an power inverter that can handle the 450W load, so it is going to be rather large. I don't think Radio Shack has a 120V-220/240V that will support 450W, it will probably cost more to buy one than it did for the receiver itself. Changing the power tranny inside may be cheaper if you could find one that would work. Quote Link to comment Share on other sites More sharing options...
sfogg Posted March 14, 2005 Share Posted March 14, 2005 500w step down transformer is $19.99 from this place... http://www.220appliances.com/transformers.asp?CategoryID=33 EDIT: Posted the wrong thing.. you need a step up transformer... http://www.220appliances.com/processtype.asp?ProductID=116&ProcessType=1 Shawn Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted March 14, 2005 Share Posted March 14, 2005 Man, those are cheap! Thanks for the link Shawn. Quote Link to comment Share on other sites More sharing options...
djk Posted March 14, 2005 Share Posted March 14, 2005 "It's only rated @ 65wpc. That is a hefty input/output ratio. Is that due, in part, to or related to the 220v Euro standard?" Don't have a clue, do you? Things are not 100% efficient (gasp!). Power factor corrected switching supplies and pulse width modulated amplifiers (Panasonic SA-XR50 for example) are closer to 80% efficient rather than your old receiver's 40% A 90W/4R rating would be about 60W/8R Quote Link to comment Share on other sites More sharing options...
ygmn Posted March 15, 2005 Share Posted March 15, 2005 It might require 50HZ power in lieu of the 60HZ in USA..... could present some problems.....ya never know Quote Link to comment Share on other sites More sharing options...
djk Posted March 15, 2005 Share Posted March 15, 2005 Its the other way around, you can't run 60hz equipment on 50hz, the 60hz transformer will get hot. A turntable may need a different pulley. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.