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You're right Chuck, I think it's great from 1 MHz and that at very high frequencies there is the problem of not being able to see the harmonics.
But I fell in love with the 7L13 and will use it in HF, VHF and UHF where I think it gives its best.

I took off the TUNING knob and noticed that it is heavy so it acts like a flywheel when tuning.
I think the only way to find out the truth is to ask someone who worked at Tektronix and knows the whole story of 7L13.

Thanks a lot Chuck.
Greetings
Attilio