Today final tubes can cost thousands of dollars, so be sure to keep tube usage at a minimum and squeeze every possible ounce of energy out of it. Here is a list of helpful hints we have developed over the years from field engineers input and our own personal observation. If the carrier mishandled the package and you fail to notify promptly, then you will lose your right to file claim.
Time is of the essence here.
If there is any noticeable damage to the carton on delivery, be sure to note this on the delivery receipt before signing. As soon as practical thereafter, check for shorts with an ohmmeter. If shorted, file a claim immediately. If not, transmitter test as soon as you can because the ohmmeter does not always tell the whole story. It would be very desirable if you could check the filament current at rated voltage because most tubes have multi-strand filaments, and one or two strands could be open without a piece breaking off and shorting.