The concern is with the current draw, as Jerry Webb clearly and accurately posted. According to the manual, at 120 VAC the maximum current draw for the LA-1K is 33 amps.
It is false security to assume all must be well if circuit breakers rated at 20 amps don't trip. It is impossible to know what is happening to wiring behind sheet-rock, to the plastic connectors splicing them, and the insulation encompassing them.
In the realm of solid state amplifiers, to be safe the rule of thumb is:
120VAC supply: limit RF output to 500 watts
240VAC supply: limit RF output to 1500 watts
73,
Kent
K9ZTV
