Any reason to prefer one of these over another?
http://store.tubedepot.com/5687.htmlAre any of these tests worth paying for?
# Standard Test Included – All tubes from TubeDepot.com are tested and guaranteed to work as they should. There is no fee for this test.
# Hi-Gain (+$2.00) – If you want a preamp tube with higher gain, you can choose this option. There is a $2 per tube fee for this test.
# Matching (+$2.00) – If you want matched pairs of preamp tubes, choose this option. You must buy at least 2 preamp tubes for us to match preamps tubes. We match to within 3%. There is a $2 per tube fee for this test.
# Balanced Triodes (+$2.00) – If you want the best performance for the Phase Inverter section of your amplifier, you can choose this option. There is a $2 per tube fee for this test.
# Matched+Balanced Triodes (+$4.00) – We can match and balance preamps tubes for you as well. You must buy at least 2 preamp tubes for us to match and balance preamps tubes. There is a $4 per tube fee for this test.
# Low Noise and Microphonics (+$4.00) – If you have a phono stage that has to have the quietest preamp tubes available, we can ensure you get the best with this option. There is a $4 per tube fee for this test.