5y3gb tube rectifier Mazda France black plate silver foil getter test strong
One tube 5y3gb Mazda made in France full wave rectifier
test TV7D/U = 74 & 71 (reference good at 40 & 40)
black plates & silver foil getter m black base , rare tube strong emission test results
5y3gb full wave rectifier
Socket Octal K8A
Filament Heater Vf 5 Volt / If 1.6 Ampere / Half indirect
box 177