Need 12sn7 advice

[Emil]

Looking to try some RCAs to add a bit of "warmth"

Here's the current crop over at ebay
https://www.ebay.com/sch/i.html?_nkw=rca+12sn7
Which would you choose?

I need a pair and need help understanding the different variations.

Much appreciated

[rollo]

Emil forget E-Bay. Call Andy at Vintage Tube Service or Brent Jessie. You WILL get the proper tubes and an free education. Go to Brent Jessie site for tutorial on 12SN7 tubes.


charles