the numbers are probably from a tube tester. it is only useful if you believe in that system.
there dozens of tube testers and the numbers among brands/vendors don't correlate
like Hickok abc/def doesn't equal Russian tube tester xyz/nbc.
you'd need to ask the tube seller which brand and which model and whether it was calibrated,
etc.
do note that most tube testers (commercial versus custom made) do not test nor have
varying test conditions, they test at whatever their designers decided decades ago. They
do not test at the design centers nor for the actual operating environment. and some
equipment pushes them to the limit, and sometimes the tubes don't last long and
in some equipment the tubes last forever (12AX7s in dynaco PAS units).
i'd either save them for replacement/testing if the SQ changes or sell them.
I use a sencor to test for aberrations (shorts, gas, low conductance, gas in shorts,...)
and depending on strength (and more importantly belief) go into pushpull amps, then
SE amps, then test, then maybe tube voltage regulators if I have one at the time.
Your ARC should be running fine for a long time, your tubes were not used to prevent
them warranting them for operation that they did not control its past, and their testing.
