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Re: [Amps] Parasitics & Filament Sag

To: "R L Measures" <r@somis.org>
Subject: Re: [Amps] Parasitics & Filament Sag
From: "Michael Tope" <W4EF@dellroy.com>
Date: Tue, 5 Sep 2006 07:21:14 -0700
List-post: <mailto:amps@contesting.com>
----- Original Message ----- 
From: "R L Measures" <r@somis.org>
To: "Michael Tope" <W4EF@dellroy.com>
Cc: <g3rzp@g3rzp.wanadoo.co.uk>; <amps@contesting.com>
Sent: Tuesday, September 05, 2006 7:02 AM
Subject: Re: [Amps] Parasitics & Filament Sag


> 
> On Sep 5, 2006, at 5:35 AM, Michael Tope wrote:
> 
>>
>> ----- Original Message ----- From: "R L Measures" <r@somis.org>
>>
>>>>
>>>> Perhaps, but your claim that infinite current will flow if an L-  
>>>> network
>>>> if it is tuned to resonance at the operating frequency is simply   
>>>> incorrect.
>>>> If that were true, tuning an amp would be a lot more dicey than  
>>>> it is.
> 
>>> Is there a source of infinite current in an amplifier?
>>> Are there ESR = 0-ohm inductors and capacitors in an amplifier?
>>> IOW, its a theoretical problem, not a practical one.
>>> My point is that an L-network can never have equal amounts of XL  
>>> and XC.
>>
>> Sure it can. Even if you are using ideal components with infinite  
>> unloaded Q, and an ideal voltage source (zero ohms source  
>> impedance), you can't get infinite current to flow in an L-network  
>> at "resonance" (XC=XL) if there
>> is a finite load resistance across the output.  Do the math,
>> and you'll see that even if you get the voltages across the L and C  
>> equal in magnitude, you won't be able to get them
>> opposite in phase if there is a finite load resistance across
>> the output. Only in the case where there is no load across
>> the output can the voltages cancel completely.
> 
> Mike -- What would be the correct load R when XC = XL ?
> 

How the hell should I know? That's like asking a stranger what
is the correct value of "R1" in some random circuit when they have 
no idea what you are trying to do with that circuit -:)

73, Mike W4EF..............................


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