> I do have one final question for everyone here. Knowing
> these numbers, input, output, plate and grid, how does one
> calculate the amp's gain and or efficiency?
Gain = 10 * log(Pout/Pin)
= 10 * log(450/20)
= 10 * log(22.5)
= 10 * 1.352
= 13.5 dB
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
> -----Original Message-----
> From: amps-bounces@contesting.com
> [mailto:amps-bounces@contesting.com] On Behalf Of KB0NLY
> Sent: Thursday, March 05, 2009 3:40 PM
> To: amps@contesting.com
> Subject: [Amps] An Extra Thank You!
>
>
> Just wanted to post an extra Thank You to the reflector for
> all those that have been patient with me and helping. My 6M
> amp project has been completed! It was powered up and
> brought to life today finally after much careful planning and
> building.
>
> Initial tests prove it's working rather well!
>
> Input 20w
> Output 450w
> Plate 375mA
> Grid 80mA
>
> I was told to keep the GI7B at or below 400mA on the Plate
> and 150mA on the Grid, i can do that easily. It will make a
> bit more power but it's maxing out my wattmeter now!
>
> I do have one final question for everyone here. Knowing
> these numbers, input, output, plate and grid, how does one
> calculate the amp's gain and or efficiency? I was trying to
> make sense of the info in the handbook but it was slightly
> over my head with all their calculations. I'm looking for an
> Elmer answer on this one!
>
> Thanks and 73!
>
> Scott KBØNLY
>
> PS: I will finish updating my website this afternoon with
> pictures of the completed amp.
>
> www.kb0nly.net
>
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