I run drive my LA-1K with an ICOM IC-7610 at up to 45 watts max (most bands using SSB phone) and only once remember getting an overdrive trip-out warning.
Even with contest CQing, I typically set the drive between 40-45 watts, with resulting output at about 900 watts, with occasional peaks at 1000.
Amp is running on 120 Vac.
The only problem I have - my amp runs much too hot - into the high 70's C.
It will stabilize on SSB Phone per above, but testing on FT8 digital shows it will overheat at around 200 watts (depending on the band), and only 175 watts on 10 meters.? Been meaning to phone Palstar - perhaps there is something wrong with it?
Fred, W9KEY