Please find below an excerpt (highlighted in bold/italic text for clarity) from Page 5 of the LA-1K Technical Manual for your consideration, Steve.
BAND SELECT
To switch bands (160M, 80M, 40M, 20M-15M, 12M/10M, 6M) press the
BAND button on the touch-screen display then select the desired band.
As can be seen above, 60M isn't a band available on the "LA-1K RF SENSING 1000W DUAL HF LDMOS AMPLIFIER" currently available from Palstar.
Thought you might have, for example, modified the firmware on your LA-1K amp to allow it to work on the 60-Meter band.
Oh btw, 6M (labeled 50MHz by some manufacturers) is an available band on the LA-1K, so I am not sure why Palstar would exclude 6M in naming the LA-1K amp because HF doesn't cover 6M.
73,
Ray
KJ5MI