MARCONI ECONOMY * VALVES install these new 6-volt Marconi valves. With a filament consumption of only .12 ..
... MARCONI ECONOMY * VALVES install these new 6-volt Marconi valves. With a filament consumption of only .12 amperes, they prolong your accumulator charge very considerably. J Type D.E.H.612 is a highly eflßcient detector valve, suitable for resistance or ...