Up for sale is an ultra-desirable, high-performance pair (2 Pcs) of vintage NOS Siemens E83CC premium Special Quality (SQ) dual triode vacuum tubes, packed in individual white boxes. Engineered in Germany to strict professional standards, these rare E83CC tubes feature robust triple mica  for ultra-low microphonics, authentic grey plates, and a  ring getter. Extremely prized by audiophiles and studio engineers, the triple-mica Siemens E83CC is legendary for its holographic soundstaging, exceptional dynamic extension, tight low-end authority, and pristine clarity.

Both tubes have been thoroughly tested on an Amplitrex AT1000 automated valve tester at nominal factory specs. Anode current (Ip) and Mutual Conductance (uMhos) measurements alongside percentage performance ratings relative to standard specs are detailed in the table below.