I didn't add the drive back in on mine, so I'm off by that 20W.
I'm not sure I completely understand why the drive is added back. You
could write a thick, thick book with what I don't know about tubes,
because when I went to school they weren't taught anymore.
Jeff/KD4RBG
---- Original message ----
>Date: Thu, 5 Mar 2009 16:11:14 -0500
>From: "Joe Subich, W4TV" <lists@subich.com>
>Subject: Re: [Amps] An Extra Thank You!
>To: "'KB0NLY'" <kb0nly@mchsi.com>,<amps@contesting.com>
>
>Efficiency (assuming grounded grid) = Pout/(Ip*Vp+drive)
>
>You don't give the plate voltage so I'll use 2000V as a
>placeholder ...
>
>Efficiency = 450 / ((.375 * 2000) + 20)
> = 450 / (750 + 20)
> = 450 / (770)
> = 58.4%
>
>73,
>
> ... Joe, W4TV
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