Since you are longer in the tooth than I... your inference of hearing loss due to my age is 3 fingers pointed back at you...A long time ago, new solid state amplifiers produced odd-numbered harmonics but tubes produced even-numbered harmonics that old people think was in the music. Now old people like the harmonic distortion produced by tubes better than having no distortion.
The buyers guide has no spec's. Maybe the output transformers in the tube amplifiers muffled high frequencies and hiss the music?
It is normal for men to have high frequency hearing loss beginning when they are only 20 years old without playing with guns and loud acid rock noises.
At 65 years old, a man does not have golden hearing, instead he can barely hear any sounds above 4kHz like in this graph:
Personal insults are not helpful in this discussion- imo.