Input vs. Output

[Tom Buchanan]

I just got my first tube type rig (Heathkit HW-16) on the air and have been enjoying making some contacts with it.  I notice the older rigs refer to RF power input and modern rigs RF power is output.  Is there a calculation to figure equivalency for input watts to output watts?

For example, the HW-16 manual specifies 50 to 90 watts input and on the antenna tuner/wattmeter it shows 30 to 60 watts output on 40m.    

73,

Tom
KG4KGY

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