Anytime the TS-520 does not putout 100 watts keydown into a 50 ohm load
,IT IS BROKE,BROKE, Look at it this way,, 160 watts input at 65%
effeciency = 104 watts output..On HF, 160 thru 15 meters 60 to 65 %
eff. is normal..A service monitor calibrated for VHF/UHF may be a bit
off at HF freqs..It happens .. Hal