Yet another dumb question...

[greiswig]

My amplifier has a 2 amp mains fuse. I have a Qualtek EMI filter (mouser part #562-857-01/46) that is rated at 1 amp at 250V. Is it safe to use that as the input filter for my amplifier's power supply? IOW, is it safe to assume that it would handle up to 2 amps at 120V?

Thanks!

[skyboltone]

My amplifier has a 2 amp mains fuse. I have a Qualtek EMI filter (mouser part #562-857-01/46) that is rated at 1 amp at 250V. Is it safe to use that as the input filter for my amplifier's power supply? IOW, is it safe to assume that it would handle up to 2 amps at 120V?

Thanks!

In my opinion yes.

[paulster]

I'd actually say not, but with a caveat.

Its rating is probably based on the size of the inductor wiring, so it will be limited by current rather than power dissipated in the device, i.e. a 1A limit at 250V will still be a 1A limit at 120V.

However, the amp has a 2A fuse because of the inrush current caused by the heater filaments warming up and any caps before the standby switch charging. In normal operation you'll be well below 2A, and probably below 1A.

You should try to find the data sheet and see whether there is any provision for handling a higher surge current, or whether the 1A rating is for all conditions. If it does permit higher surge currents then you'll be okay, otherwise you'll want a bigger one.

[greiswig]

I'd actually say not, but with a caveat.

Its rating is probably based on the size of the inductor wiring, so it will be limited by current rather than power dissipated in the device, i.e. a 1A limit at 250V will still be a 1A limit at 120V.

That's what I was afraid of.

However, the amp has a 2A fuse because of the inrush current caused by the heater filaments warming up and any caps before the standby switch charging. In normal operation you'll be well below 2A, and probably below 1A.

You should try to find the data sheet and see whether there is any provision for handling a higher surge current, or whether the 1A rating is for all conditions. If it does permit higher surge currents then you'll be okay, otherwise you'll want a bigger one.

Unfortunately, they only quote the RMS current capability, not surge. I guess the thing is cheap enough that it couldn't hurt to try it. It'll fail open if anything, so it shouldn't hurt the amp.

Thanks, all!

[Structo]

Greiswig, does that fit the standard IEC cut out on the D'Lite chassis?

And do you notice any difference in hum or noise with it installed?

Thanks, Tom

[leaveitalone84]

http://www.mouser.com/catalog/632/968.pdf

That is the mouser page with it on it.

It is a standard IEC socket.

[greiswig]

http://www.mouser.com/catalog/632/968.pdf

That is the mouser page with it on it.

It is a standard IEC socket.

And note that they have a 3 amp version of it that is the same size, albeit with lower inductance.

Structo, I don't know about performance: I haven't installed it yet. But it should fit just fine. I have issues with noisy power at one place I play nearly every week. Hoping this'll help. I should have gotten the 3A version. I hate to pay for more shipping.

[paulster]

I just checked their own page (http://www.qualtekusa.com/catalog2/emi_ ... 701046.pdf) and that states 1A RMS MAX, so I'd imagine by the MAX that there's no provision for a higher surge rating.

[skyboltone]

when winding inductors, what exactly is the difference in wire size between a 1 amp wire and a 2 amp wire?

[greiswig]

Greiswig, does that fit the standard IEC cut out on the D'Lite chassis?

Tom, no it does not fit. The opening would have to be almost 23mm in height for the thing to go in.

[paulster]

when winding inductors, what exactly is the difference in wire size between a 1 amp wire and a 2 amp wire?

You have to wonder how marginal they wind them if they offer a 1A, 2A and 3A version of the same part.

[Tubetwang]

I had a few of these in my parts bin...i found them to take too much space in an Allyn or Nik chassis...

Fitting the board became problematic...

[Structo]

Greiswig, does that fit the standard IEC cut out on the D'Lite chassis?

Tom, no it does not fit. The opening would have to be almost 23mm in height for the thing to go in.

Well that sucks.
I was thinking of getting the 6A one.

[mhuss]

It's a bit less convenient, but you could always make the functional equivalent on a small board with a couple of coils and caps.

--mark

[greiswig]

It's a bit less convenient, but you could always make the functional equivalent on a small board with a couple of coils and caps.

--mark

True, or you could order 562-851-03/4 from Mouser. I think that will fit in the available space. I think that's what I'm going to do.