We are an authorised dealer for new sensor products such as Sovtek, Electro-Harmonix, Mullard, Tung-Sol and Genalex. We sell high quality inventory, no factory seconds like many other sellers. 2 x electro-harmonix 6CA7EH / 6CA7 / EL34 grease bottle vacuum tubes from Lp and Gm within 10%. This classic large bottle 6CA7 is a tetrode and not a pentode like the EL34. Both tubes are interchangeable, but many prefer the rich and detailed sound of a tetrode to a pentode. electro-harmonix rocks the vacuum tube community with the superior quality of the "EH" series. Electro-Harmonix sound effects are known worldwide for the soothing warmth of their analog sound and their line of "EH" premium tubes continues in this tradition of classic sound. 6CA7 Big Bottle Tetrode Matching power tubes for even current draw are important for maximum performance.