wrote in message
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My old TS-520S is said to put out 160 watts DC CW and
200 watts PEP SSB .
Whats the minimum dummy load requirement to tune it ?

There are kits for 100 watt dummy loads. Would that be
enough for brief ( ~ 10 sec ) tuning ?

Are there standards as to how the rating of a dummy load
is to be interpreted ?

Dave WB3DWE Temple, TX

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The old tube rigs used power input to finals as their customary metric.
Considerably less power was output as RF power, which is all that the dummy
load is concerned with - assuming that you have a sentient dummy load. 8)

A standard 200 watt air cooled dummy load will suffice.

Ed, NM2K