HI Jussi,

Not sure any of this is super simple?  In the past, I think several have used HiPot testers between the tube elements.  I am sure if there are dedicated testers for that tube, but we have to use what is available to us.  To match them up, you could take a look at the bias drawn one tube at a time, during key down with no RF input.  That should match things up fairly well.  However, on amps like yours and some of the Alphas, etc, they use Bias switching so you probably can't see the bias or that the tube is drawing current wise during idle conditions.  Maybe there is way to disable Bias Switching on that amp for a test?    Others don't think matching is necessary in that amp, as long as the tubes are A-OK ?  If the tube is putting out good power on the highest band, you are probably A-OK.

If you haven't used those tubes in a while, some suggest putting them in the amps, without B+ and let them cook for a while before putting B+ on them.  I have always done that, the few times I didn't or got in a hurry, that when things didn't end well for that tube.  One really never knows for sure what is cause of death in tubes.  

Gud luck and 73 de w5jay/jay..