Everything about Edgetech Industries (ETI)
Subminiature CV4501 tube (SQ Model of EF72), 35 mm extended × ten mm diameter (excluding prospects) Early tubes employed a metal or glass envelope atop an insulating bakelite base. In 1938 a method was formulated to make use of an all-glass construction[51] Using the pins fused within the glass base from the envelope. This authorized the design of