Step down trafo 230-110V

[jock]

How do I know which specs this device should have? Is it the power of the amp 300W (RMS) that dictates the power of the transformer?

In my case it´s about a Mesa Walkabout amp.
For the conversion of the amp itself I was quoted $480 by the Swedish Mesa dealer.
So it will have to be a separate step down trafo...
What should I get?

 

[v-12]

on the back of your amp is should say what the voltage consumption is, i.e. 130w @ 120 vac; or something like that. you'd probabaly get by just fine with a transformer maybe double or triple you consumption. i'd get the biggest one i could afford though, in case you pick up some other u.s. gear. my 400+ used to share a 2000w transformer with the pa or a guitar rig, and never had any problems.

 

[tadawson]

Much like amps though, the higher power the transformer, the heavier it is. I have a coupld of 2500 VA units for other stuff, and they weigh about as much as the gear that they are processing power for . . . . . so, while electrically going bigger won't hurt, it can sure make your back ache!

- Tim

 

[jock]

Here is a pic of the back of the amp. It only tells the value of the fuse...
http://www.mesaboogie.com/Product_Info/Bass_Amps/walkabout/WalkAboutCloseUp/Walkabout-RearLgr.jpg

Could it be that it´s not on that pic because it´s a general pic for MESA´s site and is only written on the actual amp. (I have not recieved the amp yet).

 

[BillyB_from_LZ]

I just looked at the back of the US Spec Walkabout that I bought on Monday and it says that the input is 120 Vac, 6 A (and specifies a 6 A Slo-Blo fuse).

This means that the amp demands up to 720 VA from the mains.

I'd guess that a 1000 or 1500 VA transformer would be enough...as it would give you some extra reserve.

FWIW, I just peeked inside too and the power transformer (a nice toroid!) has a single 120 Vac primary...

 

[jock]

I just looked at the back of the US Spec Walkabout that I bought on Monday and it says that the input is 120 Vac, 6 A (and specifies a 6 A Slo-Blo fuse).

This means that the amp demands up to 720 VA from the mains.

I'd guess that a 1000 or 1500 VA transformer would be enough...as it would give you some extra reserve.

FWIW, I just peeked inside too and the power transformer (a nice toroid!) has a single 120 Vac primary...

Thanks!
I tried to google the VA vs. Watt relation and found the watt rating is typically 65% of the VA rating.
Is this correct?
I´ve found some converters that are rated in VA and some in W. A bit confusing to me.

 

[BillyB_from_LZ]

I'm not sure what is typical...that sounds pretty lossy though...