Do you Think Altec model 19 is outdated speakers ?

Excellent.  You responded indirectly and positively to my question of point.  Your Altecs are musically compelling to you.  That is what is critical and the opinions of others does not matter.  
 

Regarding cabinet design, it has advanced substantially from an engineering perspective with regard to materials, computer assisted shaping, and bracing all designed to remove internal frequency reflections, reinforcements, and cancellations.  Speaker finishes for some companies are as important to SQ, others not, so generalization that the art of cabinetmaking was better in the past cannot be taken as an axiom.  
 

So I am glad you find your system musically compelling and I do not understand the purpose of your post, including the YouTube stream. 
 

Nice and clear.

A bit boxy and the peaks in the highs would have to go, at least for me.  Seems to be adding a bit of sibilance.

I owned a pair and thought they were very enjoyable, but I always preferred my Lascalas, for my own reasons and tastes. I heavily damped the horns, woofer frames and upgraded crossover components which brought the 19s to another enjoyment level but to my ears had two issues. I easily heard the coherence disparity between the bass section and horn, and the image was too exaggerated, especially with my near field listening. On the other hand, I prefer them over so many other speaker types, costing much more. I cannot comment on the sound, as I am not familiar with the song played, and YT compresses.......as long as you are happy, and this is what it is all about. Overall, nice system/room. My best, MrD.

What's outdated when it comes to speakers? The Model 19 had pros and cons:

Pros: sounds great, fabulous drivers, well-made, efficient

Cons: large, resonant cabinets (some would count that as a pro), inefficient crossover design w/ fixed slope, complex cabinet shape (difficult to repair or replace)

There are no outdated speakers when it comes to great American brands such as Altec Lansing. I’m still using speakers made in 1986 and they sound incredible. I had to crossovers redone and that’s about it. Keep rocking on!