6SN7 tube question


Hello,

I need to replace the tubes in my Rogue 99 line preamp, which uses the 6SN7 tube. I was looking at an online seller who offers the following options with an affordably priced 6SN7 for a few dollars extra:

1. Balanced Triodes
2. High Gain
3. Low Noise and Microphonics
4. Matching

Options 3 and 4 seem most desirable for a preamp. My question is whether it is worth the extra few dollars (approx. $6 per tube) or is it just a pure marketing ploy to get suckers like me to drop more dough?
actusreus
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Only 2 of the 4 6SN7 tubes have any sonic impact. I can't remember if they are the right 2 slots or left. You can save money buying 2 cheap and 2 vg tubes. I don't think any have to be matched.
FWIW we find the Tung-Sol tube to be just as unreliable as the EH tube. Both are made in the same plant and the big difference is the color of the base.
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A good 6sn7 with transconductance and plate current within 10% or less triode-triode ,and at least 30% higher than the minimum,not microphonic and low noise is a good candidate bu do not compare brand of  6sn7 tubes if their Gm & Ip are not  within 5% of their tested reading Gm & Ip brand-brand since brand with higher test reading will always be on top..