12BE6 tabung tube Paket 5 (lima) tabung Pope Electron Tube NOS First registered in October 1945 for +/- 90 V max peak cathode to heater insulation. Re-registered in June 1951 with the same cathode-heater insulation. Registration updated in December 1959, with cathode-to-heater insulation uprated to +/- 200 V. ...