Not sure about the higher wattage ones he builds, but I'm betting the small one is just like my Ampwell House Attenuator I built using an L-Pad from Parts Express. The AHA is good for up to about 25-30 watts rms.
I've also built one with the dual ganged 8 ohm L-Pad that can be switched between 4 and 8 ohms.
As long as you don't exceed the attenuators wattage rating it will be safe. Be aware that driving your amp hard like that will wear out tubes faster.
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