Mullard EF80 Valve
Valve manufacture in the UK was a large industrial operation in the 1950s with millions of valves being produced each year. The plants were large and the processes very labour intensive by todays standards. One of the most prolific of the valves of the time was the Mullard EF80. This pentode was used in Intermediate Frequency amplifiers for many types of equipment: radio, Radar but probably best known as the dominant workhorse of VHF television receivers.