Jack, I looked up the specs on the 813 that I have here, in a pdf file..

It says:

"Because of its high power sensitivity, the 813 requires very little driving power to give full power output. For example, in class C telegraph services under ICAS conditions, a single 813 is capable of giving a power outpuot of approximately 375 watts with a driving power of only about 4 watts."

--
73 = Best Regards,
-Geoff/W5OMR

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