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Vintage Tube amps

Question
I’ve heard a tube amp once and the midrange was just stupid. I mean wow….but the high sounded set back and were almost inaudble drowned out by the mid range. Was that just the system or is that all vintagetube gear?  It was just a 2 watt amp and it was on Zu dirty weekend speakers. 
If you use say a rebuilt Dynaco st70 and use a quality tube pre will the highs always feel as fessed or if you set it up correctly will they feel more natural to the music? I’m thinking just the set up made it sound like it did. 2 watts and Zu full range drivers….bad room….

I don’t care so much about bottome extension because I love subwoofers but I love the mid range I heard and just want the high end to not be such a struggle to hear…i

any opinions would be welcome 
bear1971
roxy54's avatar
roxy54
8,078 posts
 
Obviously, most tube amps are not like that, but the sound of any amp is affected by the impedance curve of the speakers it is driving.
jasonbourne52's avatar
jasonbourne52
2,863 posts
 
A high output impedance tube amp + a speaker with a low and falling impedance in the high frequencies will sound rolled-off! Conversely a speaker with a rising impedance in the bass frequencies will sound excessively heavy! 
jasonbourne52's avatar
jasonbourne52
2,863 posts
 
Tube amps with output impedance of 1 ohm and higher will act like "tone controls" as they track speakers' impedance curves! 
knotscott's avatar
knotscott
996 posts
 
Most of the best systems I’ve heard had tube amps....some old, some new. How they sound depends on a ton of variables, but the sound on all of them can be tailored a bit by the tube choices. At their best, tube amps offer great frequency response, and a holographic image.
jetter
3,052 posts
 
Every audiophile should be required to listen to a vintage Dynaco ST70 with quality tubes.  

It will provide the floor for how good a low cost tube amplifier can sound.
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