1 tube e499 Philips made in the Netherlands early 1930's
tested on tube tester Funke W19S = 4.8mA (reference good at 3.4mA) with 200 volt on anode
gold coated glass, old production 1930's
E499 = WE28 = NW4/1 = NW41 = 5-499 = A4AF = RV4104 = 4A7_Ultron = W4110
triode audio frequency
Socket Base Europe 5-Pin , B5
Filament Heater Vf 4 Volt / If 1 Ampere / Indirect
box 209