Up for sale is a marched quad of the legendary Mullard EL34. These are the single getter xf2 model. They have been matched within 5% on an emission tester. They are used, but still test strong, at 11.5, 12, 12, 11ma. The NOS spec is 13ma, on my tester. The Mullards are generally regarded as some of the best sounding tubes of this type. They tend have a long useable life, your usage my vary. Here's an opportunity to listen to some of the best. All shipping is insured. Thanks for looking.