EFP60 - Secondary Emission Amplifier Almost certai.
EFP60 - Secondary Emission Amplifier
EFP60 - Secondary Emission Amplifier Almost certainly Philips EFP60 was the first high-frequency amplifier based upon the secondary emission effect. T.
Philips
EFP60 - Secondary Emission Pentode
page 1 2 3 4 5 6 EFP60 sheet 1 2 A B C FP date 1948.10.06 1948.10.06 1949.01.25 1949.01.25 1949.01.25 1999.07.04 .
