Question About Setting Octaves in the High Treble

[Robert Finley]

I am learning to tune the piano by ear and have a question about tuning octaves in the high treble and performing the tests on them. Lower down the piano and for an octave or two above the temperament octave I use a 3rd-10th test to check whether the beat rate of the 10th is the same as or slightly faster than the 3rd, to provide an octave that is correctly stretched. When I go higher in pitch I use a 3rd-17th test so that I can still hear the beats and do the comparison. The problem I am having is that when I go still higher, say in the final octave, I can hear the beats of the third but I can't hear the beats of the 17th, or any ripple at all. I can't therefore compare the two beats rates and check the octave. The higher note also dies away quicker so it makes it even more difficult. Is there any special technique I should use to be able to hear the beat rate of the 17th so that I can check the higher octaves? Thank you very much for your help. 

Robert Finley
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