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Re: [Amps] Rich is a good guy

To: R L Measures <>,"" <>
Subject: Re: [Amps] Rich is a good guy
From: "Dr. David Kirkby" <>
Date: Sun, 25 Jun 2006 22:36:11 +0100
List-post: <>
R L Measures wrote:

> Are you willing to sign on with Tom to the idea that a 3-500Z  operates 
> linearly in the region of 1.6a-peak?

I responded to the moderator concerning his comments that amps is not a 
  place for either praising or burying Caesar.

I'm *not* at this point wishing to discuss any particular issue with the 
3-500Z, which is a tube I have never used, or took much notice of its 
data sheet.

>> Just a short (1 day or so) disabling of an account might clean it  up 
>> a bit.
> Once a hot thread is started and the conflagration ignites, would  
> sending a copy of the replies through the censor make the fusilade of  
> direct replies to other combatants disappear?

There's nothing wrong with a hot topic. But when it gets too personal, 
aggressive etc, then there is a problem.

> The wonderful thing about the Internet is its immunity to megalomania.

Well that is not the case. It is illegal to send spam in most (all?) US 
states. It's illegal to have pornographic images of children in the UK 
and I expect the US too. So there is a degree of censorship on the 

You might get a little bit fed up if the mailing list was taken over by 
those wishing to discuss flower arranging, or the flat earth society. 
There's a place for those topics, but it is not here. It would be 
considered 'off topic'. In the same way the personal insults and 
aggressive manner should off-topic.

>> Sometimes if the arguments could be written on a web page and  someone 
>> pointed to that it would be useful. I tried to do with the  RMS power 
>> argument.
> Excellent idea since there are apparently many who still do not know  
> that PEP measurements produce an RMS value.

That statement lacks rigor, but even then I believe it is incorrect.

For a single sine wave of 1 W (mean power), the PEP is 1 Watt too.

But mean and RMS powers for a sine wave have a factor

sqrt(3/2)=1.224744871391589 difference between them.

So for the case of a single tone, the PEP (which is the mean for one 
tone) is not the same as the RMS. So PEP measurements do *not* produce 
an RMS value.

Dr. David Kirkby
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