My experience with tubes isn't as extensive as other A'Goners, but I've noticed with both my Blue Circle BC21 and Kora Hermes that whenever I changed the stock tubes to NOS to varying degrees I could always hear an immediate difference.
Tubes don't seem to need as much time as other components to "break-in", and I've also noticed that some go through drastic character changes before finally settling in. In my limited experience, 48-96 hours sounds about right.
Tubes don't seem to need as much time as other components to "break-in", and I've also noticed that some go through drastic character changes before finally settling in. In my limited experience, 48-96 hours sounds about right.