Telefunken EF804 Tube NOS/NIB (sealed box, see photo) Special Quality 10,000+ Low Noise Pentode for microphones In 1951 Telefunken started the 800 Series tube design and offered their improvement to the EF12 design; the EF804S is an identical version of the EF40/EF86 but with a different pin layout that offered less cross talk from the 1950 standard AC heated filament
Telefunken EF804 Tube NOS/NIB (sealed box, see photo) Special Quality 10,000+ Low Noise Pentode for microphones In 1951 Telefunken started the 800 Series tube design and offered their improvement to the EF12 design; the EF804S is an identical version of the EF40/EF86 but with a different pin layout that offered less cross talk from the 1950 standard AC heated filament
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