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[AMPS] L-4B grid ckt shorts

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Subject: [AMPS] L-4B grid ckt shorts
From: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK)
Date: Sun, 21 Sep 1997 22:49:35 +0100
Rich Measures wrote:
>>
>P=I^2*R.  P=10a^2*1 ohms =100*1 =100W  Is this the rating of the resistor 
>in question, Ian?  

I beg your pardon: make that 3-and-a-bit amps continuously, for a 1-ohm,
10W resistor. Therefore whatever current burned that resistor out was
>3A for several minutes probably, or >>3A for a much shorter time.

The same conclusion still applies, though. It seems incredible that so
much grid current could be flowing in an oscillation condition. I mean,
if that was the grid current, how big would the cathode current have to
be... and where would it come from?


73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.demon.co.uk/g3sek

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