RCA 9KX6 Vacuum Tube

RCA 9KX6 vacuum tube is a mid‑century vacuum pentode produced by RCA Victor Co., Inc., listed in vintage RCA tube catalogs as part of the receiver‑tube family. The 9KX6 designation is documented by RCA service literature and appears in color‑television material from the late 1970s, confirming its role in RCA CRT‑based equipment of that era. While the same 9KX6 type designation has been offered by other brands, including Sylvania and GTE, modern suppliers still catalog NOS 9KX6 stock under the RCA lineage, underscoring cross‑brand interchangeability among vintage tubes. In typical RCA‑chassis, the 9KX6 would have served as a small‑signal amplification stage within radio and television circuits, providing moderate gain in the amplification chain while fitting the compact form factor common to mid‑century tube sets. This tube is referenced in historical tube catalogs and museum references that document RCA’s pentode offerings alongside other receiver tubes, making it a common target for restoration projects seeking period‑correct components. As with any vintage tube, substitutions or restorations should be guided by the exact circuit requirements and verified against the original RCA service data for the specific set being serviced.