This is a matched quad when purchased not long ago. They are like in new conditions as they don’t have 20 hours on them. I purchased from an official tube store but I don’t know where I put the receipt. Sale is for the USA only.
Item Tag: Tung-Sol 7591A
-
Tung-Sol 7591 Power Vacuum Tube USA Amplitrex Tested Strong 74% Gm
Tested strong on an amplitrex AT1000 tube tester at 68% emissions and 74% gm
-
7591 TUNG SOL VACUUM TUBES PAIR NOS
Tested on a Heathkit TT1, minimum good tube is 6600 µmhos and NOS tubes tested at 10200 µmhos. Also tested on a Hickok 539c. We are here to help!
-
New 4x Tung-Sol 7591A | Matched Quad / Quartet / Four | Power Tubes | Free Ship
Matched Octet. Matched Sextet. Matched Quad. We all know that swapping out tubes can be one of the more effective ways of improving your tone. At Tonal Tubes, we help you achieve that next level tone.