tungsten tubes for Dummies
Subminiature CV4501 tube (SQ Edition of EF72), 35 mm extended × ten mm diameter (excluding potential customers) Early tubes applied a metal or glass envelope atop an insulating bakelite base. In 1938 a way was produced to make use of an all-glass design[51] With all the pins fused in the glass base from the envelope. This authorized the look of a