The ECC 803S (ECC803S) Telefunken Gold Pin High Mu Twin Triode tube is RARE and difficult to find. The ECC803S is a very low noise, special quality 12AX7, made with the old-style Telefunken German precision. These have the ultra wide bandwidth of the Telefunken ECC803s, but also have nicely matched internal triodes, gold pins, and have been carefully factory-screened for low noise.
New Old Stock/New In the Box * No longer available for export
Designed for use in coaxial cable amplifiers, video amplifiers, broad band IF amplifiers in communication links, and TV equipment. New old stock * No longer available for export. MFR: Amperex SKU: 7737
The red base 5691 is a premium 6SL7 made to last over 10,000 hours and produce low noise. We have a couple of tubes branded GE but are manufactured by RCA. New old stock * No longer available for export. MFR: RCA SKU: 5691