[mikek200]

I need some clarification on tube quality..
 
I am using an amp ,built by,Spritzer,which takes 4 tubes..2 6CG7 ,and 2 12AX7's..I use Mullards,Amperex,RCA,GE,Lorenz,Siemens.
 
I was buying from a seller,that claims,most tubes built after 1950,have declined in quality.
Can any tube rollers out there,verify this
 
For the last 3 years,I have used,many,many tubes,from all manufacturers,and have never heard any difference in sq,and have never had a tube go faulty on me.
99% of my tubes,were built in the 1960's
 
Any info,/advice would be greatly appreciated
 
Thanks,
Mike