On Jun 24, 2006, at 10:18 AM, Joe Subich, W4TV wrote:
>
> Rich writes:
>
>> P = I x E comes pretty close.
>
> That's fine but as I said: "I don't have the constant current curves"
> which means I do not have any way to determine the peak (or even
> average through the full RF cycle) cathode to grid voltage in the
> 3CX1200A7.
>
> Your "smart" replies do not add any thing of substance to the
> technical discussion and only enhance your reputation as an
> egotistical bully. It's a real shame you have never learned to
> contribute in a civilized and technically supportable manner.
> You seem to have something to contribute but it gets lost in the
> smoke, hand waving, and put downs.
According to what I read in Care and Feeding ... ..., average grid-
dissipation is approximately = to average grid/cath.-V multiplied by
average (meter-indicated) grid-I. I presume that average grid-cath,-
V is 0.639 x the peak grid-cath. potential in typical operation.
IOW, P = I x E is close.
Since the rated avg. grid dissipation is 50w max, and, from the
characteristic-curves, the grid-cath-potential is roughly 110v-pk x
0.639, or 70v-avg in typical operation, I-max is 50w / 70v = 0.71,
so .71A will produce a grid-diss. of c. 50w in typical operation.
cheers, Joe, and I plead guilty to not being civilized.
>
> 73,
>
> ... Joe, W4TV
>
>
>
>> -----Original Message-----
>> From: R L Measures [mailto:r@somis.org]
>> Sent: Saturday, June 24, 2006 10:21 AM
>> To: Joe Subich, W4TV
>> Cc: Gudguyham@aol.com; amps@contesting.com
>> Subject: Re: [Amps] SELL: Ameritron AL1200 Contestor's Amplifier
>>
>>
>>
>> On Jun 24, 2006, at 6:19 AM, Joe Subich, W4TV wrote:
>>
>>>
>>> The Eimac data sheet (Reference Data from the web) gives a 50 watt
>>> grid dissipation rating. I don't have the constant current curves
>>> to see what that works out to but the grid of a 3-500Z is rated for
>>> 20 watts.
>>
>> P = I x E comes pretty close.
>>>
>>> 73,
>>>
>>> ... Joe, W4TV
>>>
>
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
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