What kind of power amplifier emits little or no electromagnetic radiation?

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What kind of power amplifier emits little or no electromagnetic radiation?

black-sun
I have a chinese generic TPA3251 amplifier. I think this emits electromagnetic radiation around 570khz that I can hear with a portable AM radio.

My chinese generic TPA3255 amplifier doesn't emit electromagnetic radiation around 570khz.

What power amplifiers do I want for minimal electromagnetic radiation?
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

Marc Martin
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This post was updated on .
Those are Class D amplifiers, aren't they?  I've never been able to tolerate any Class D or T amplifier.  As they use pulse width modulation which generates a lot of noise.  I instead use older tech -- Class B is fine.  I have one from Creek and one TEAC that doesn't bother me at all, but there was a time, decades ago, that no amps were Class D or T.  So all of those would have been fine.

Marc
 
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

black-sun
What about class AB? I think Class AB consumes less energy than Class B.
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

Marc Martin
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On August 23, black-sun [via ES] <[hidden email]> wrote:
> What about class AB? I think Class AB consumes less energy than Class B.

Yes, I think Class A, AB, and B are all fine.  Although maybe A consumes so much power that it may cause different issues for people with sensitivities.

I think the only ones we need to avoid are Class D and T.

Marc
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

black-sun
Do you think http://www.sovox.cc/pro.asp?id=300&title=Transistor%20Amplifier&CatalogID=21&rootid=40&kai=1 (SV Audio SA60) is a proper class AB amplifier without electromagnetic radiation?

Do you recommend any specific affordable class AB amp?

Or, do you know any specific affordable class D amp that emits little or no electromagnetic radiatoin?
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

Marc Martin
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> Do you think
> http://www.sovox.cc/pro.asp?id=300&title=Transistor%20Amplifier&CatalogID=21&rootid=40&kai=1 (SV Audio SA60) is a
> proper class AB amplifier without electromagnetic radiation?

Well, all amplifiers are going to have electromagnetic radiation.  The thing I'm trying to avoid is pulse width modulation.   If that description is correct (that is, it really is a Class AB amplifier), then I'd think it should be okay.  But I've never heard of this brand or amp, so I can't say for sure.

Marc
 
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

black-sun
This post was updated on .
Do you recommend any specific affordable class AB amps?

I'm looking into SV Audio SA60 and Dayton APA150 at this moment.

Dayton APA150 // https://www.tnt-audio.com/ampli/dayton_apa150_e.html and https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-dayton-audio-apa-150-amp.6571/

From the reviews, it's hard to know whether Dayton APA150 uses a linear power supply or a switch mode power supply.
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

Marc Martin
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> What kind of idle power consumption and active power consumption can I expect from class AB amps?

Heh, I have no idea... one would probably need a Kill-a-Watt meter plus the amp you are interested in using at the volume levels you will typically be using it at.

Marc
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

black-sun
https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-dayton-audio-apa-150-amp.6571/ says Dayton APA150 is a class AB amp with a linear power supply.

User manual on http://www.daytonaudio.com/product/783/apa150-150w-power-amplifier says Stand-by Power Rating is 120V 6W; 230V 7W.

Does this mean that it consumes 6~7 watts while it's powered on, but there is no sound?
If that's true, I'm going to buy it.
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

Marc Martin
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This post was updated on .
You know, I've actually tried the Dayton APA150, and for whatever reason, I could not tolerate it.  I don't know why.

But I agree, it seems like from the class of amp it is, it should be fine.

Marc
 
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

black-sun
This post was updated on .
You could not tolerate it because of electromagnetic radiation or dirty electricity?

If you have Radio Shack 12-467 and Tecsun PL-310ET, you can somehow detect the offending frequencies.
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Re: What kind of power amplifier emits little or no electromagnetic radiation?

Marc Martin
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On August 23, black-sun [via ES] <[hidden email]> wrote:
> You could not tolerate it because of electromagnetic radiation or dirty electricity?
 
I don't remember.  This was years ago.  It could have been chemical off-gassing, for all I know.

Marc