b405 tube philips netherlands power triode globe old production pre war time

one tube B405 Philips globe balloon, old production, 
tested on tube tester funke w19s = 30mA (reference good at 22mA) brown base, rare power tube for last stage audio

Philips Eindhoven Netherlands
Triodo Power/Output 
B405 = LL25 = A25 = DP4 = L4 = L414 = P425 = RE114 = RO4206 = DU412 = DV27/4 = DX502 = L415 = M54 = U412 = V62 = H_Adzam = P3 = CL975 = P414 = CL104 = TB06 = 2-405 = RE124
Similar tubes  420LL ; 4B5_Ultron ; 4BFF ; BFF ; C303B ; C306B ; C_Adzam ; D05/4 ; D5 ; D94 ; G405 ; L44 ; LX414 ; OX45 ; P415 ; R77 ; RO4305 ; SP4_Triotron ; TMBF2 ; TMD ; V82
First serie 1925
Socket Europe 4-Pin B4 (Eu A, E, 4A)
Filamento Heater Vf 4 Volt / If 0.15 Ampere / Direct / Specified voltage AC/DC

 
box 139