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Hum from Headphone amp with 220V with 110V adapter
Old 14th February 2019
  #1
Here for the gear
Hum from Headphone amp with 220V with 110V adapter

Hello

Not sure if this is the right place to ask this. Sorry if it isnt. Ive done some googling about this and cant really find a solution.

I have a headphone amp with 220V power and it has a 110V adapter. It makes a ton of noise and I am assuming its because of this. Anyone know a way to make this thing quiet?

Thanks

Jason
Old 14th February 2019
  #2
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Richard Crowley's Avatar
 

This is as good a place as any. We can probably work on sorting this out, but we will need some details.
What headphone amp are you asking about?
When you say "it has a 110V adapter", does that mean it is built-in to the headphone amp, or a separate piece?
When you say "ton of noise", can you identify the noise? Hiss? Hum? Random ("popcorn") noise?
Is it making this noise on its own (without connection to the audio source)?
Does it pass audio at all, or are you hearing only noise and no audio signal?
If the audio signal is present, how loud is the noise relative to the audio signal?

We assume that you are operating with 110V power mains?
If you complete your user profile to reveal what country you are in, that is often helpful.
Old 19th February 2019
  #3
Here for the gear
Thanks so much for the reply.

Its an img Stage Line PPA-1

Ill have to take a pic of the plug. Looks like the European style plug and has a cheap black plastic adapter that allows it to be plugged into US outlet. Not sure aboiut all the volt stuff--probably shouldve just left that out as I am not sure.

The noise is a hum...i dont know enough about it but I think it is a grounding thing. Both the hardwired power cord and adapter are two prong. It does pass audio and hum is loud enough to make it unusable. I will take a pic of cord and adapter, listen more intently to what its doing (so I can describe better), and fill out my profile...isnt everyone from the US? Lol...sorry about that.

Thanks...will post more soon.

Jason
Old 19th February 2019
  #4
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nosebleedaudio's Avatar
 

Quote:
Originally Posted by mrjason71 View Post
Thanks so much for the reply.

Its an img Stage Line PPA-1

Ill have to take a pic of the plug. Looks like the European style plug and has a cheap black plastic adapter that allows it to be plugged into US outlet. Not sure aboiut all the volt stuff--probably shouldve just left that out as I am not sure.

The noise is a hum...i dont know enough about it but I think it is a grounding thing. Both the hardwired power cord and adapter are two prong. It does pass audio and hum is loud enough to make it unusable. I will take a pic of cord and adapter, listen more intently to what its doing (so I can describe better), and fill out my profile...isnt everyone from the US? Lol...sorry about that.

Thanks...will post more soon.

Jason
So, it does NOT have a ground?
Sounds like it needs/wants to be grounded..
It could also be a polarity issue, if the hum is real loud that sounds more like something other than or in addition to NO ground.
All gear should be grounded with a few exceptions..
Old 19th February 2019
  #5
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Richard Crowley's Avatar
 

Your img Stage Line PPA-1is designed for operation from 230V mains power. That is what it says on the back if you look at it.
You cannot operate it from the 115V power commonly available in North America.
Your little plastic plug adapter will only convert the plug, it does nothing about the voltage.
If you want to use that unit on 115V power, then you need a proper voltage converter.
For example:

https://www.amazon.com/Travel-Smart-.../dp/B006NRXXCG

Old 20th February 2019
  #6
Here for the gear
Ah, I see. Just took some picks and did see that it says 230V. I'll give it a shot! Thanks so much for your help.

J
Old 31st March 2019
  #7
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Hey this adapter fixed my issue. Thanks so much!
Old 4th April 2019
  #8
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Richard Crowley's Avatar
 

Good result.
It is important for all of us to remember that while much modern gear uses "universal" power supplies that operate on anything from 100V (Japan) to 240V (everywhere except North America), there is still many cases where gear is "hard-wired" for 115-117-120 V (North America) or for 240V (most of the planet). And there are even vintage pieces from Japan that are hard-wired for 100V.

Those little plastic plug converters are made for use with gear that has universal power input.

While it is semi-"safe" to plug 240V gear into a 120V power mains, as you demonstrated, it will result in either complete failure or extremely poor attempt at proper operation.

HOWEVER, connecting vintage gear from North America (120V) or Japan (100V) into a 230-240V power mains is practically guaranteed to at least blow a fuse (if it has one) or to ruin the power supply and maybe the entire circuit of the gear. ABSOLUTELY NEVER RECOMMENDED UNDER ANY CONDITIONS.

There are many solutions for converting between 120V and 240V. Some of the very cheapest are rather a kludge that will work only with simple loads like a mains=operated electric shaver (likely a vintage piece of gear itself). But the cheap/simple/light-weight "adapters" are rarely suitable for proper audio gear.

in this case we can see how much power (watts, amps) the gear draws, and select a suitable converter (transformer) to handle the load. If you have a lot of gear from the wrong side of the Pond, there are larger transformers that allow you to use many 240V devices in North America or vice-versa.
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