Ruby 12AX7 HG+ High Gain Preamp Tube
Our highest quality 12AX7A tube. All pre-amp tubes are properly tested for quality assurance.
HG Grade: RUBY standard grade that will work in all positions in an amplifier except in very high gain circuits, usually the first gain stage in a combo amplifier.
HG+ Grade: For use in high gain circuits.
Note! Ruby does not manufacture vacuum tubes, these are various branded tubes with Ruby's sticker on it which means its been hand selected from lots of tubes to meet the Ruby's desired specification and they are rigorously tested.