I have used Electro Harmonix for years and still have a EH12ax7EH in position 1. The tone improvement is the best thing about the tubes. A smoother gain, which is good.
Price: $19.95 (new)
Where Obtained: Torres Engineering
Replica of what is considered to be the best preamp tube of all time.Just pop 'em in and be amazed.
Groove Tubes is one of the top tube companies around.I just put them in today so only time will tell.They immmediately improved the tone of my Marshall JCM-800.They are well built tubes.Made in the USA.