I’ve experienced onset odd/poor sound from cables/tubes/electronics that I received via common carriers which eventually resolved itself.
The tubes attracted dust like a magnet so I supected that they had picked up a static charge from the sorting systems, belt transports and scanners used to distribute the packages.
With the tubes I found that thermally cycling them 2-3 times helped (on for for a usually short listening session, then off, then on for the next one).
Most tubes sounded good after this (no longer dust magnets either), but did improve with 10-50 hours of playing time.
Only noticed the dust (cat fur;-) attraction with tubes, but it may have been taking place with the cables/electronics as well.
Never noticed the dust thing with tubes purchased locally from various thrifts and flea markets (mainly from old tube caddies).
Just something to think about.
DeKay
The tubes attracted dust like a magnet so I supected that they had picked up a static charge from the sorting systems, belt transports and scanners used to distribute the packages.
With the tubes I found that thermally cycling them 2-3 times helped (on for for a usually short listening session, then off, then on for the next one).
Most tubes sounded good after this (no longer dust magnets either), but did improve with 10-50 hours of playing time.
Only noticed the dust (cat fur;-) attraction with tubes, but it may have been taking place with the cables/electronics as well.
Never noticed the dust thing with tubes purchased locally from various thrifts and flea markets (mainly from old tube caddies).
Just something to think about.
DeKay