Historic straightening valve 1561 PHILIPS MINIWATT made in Holland around 1930/35. Double half-wave valve (full wave) for power supply circuits designed for use in Radio equipment but which finds excellent and specific application in low frequency Amplification power supply stages. The 1561 in question is one of the most beautiful and performing, in perfect condition with a well stabilized structure with double support and dark gray striped plates and filament with spring suspension. Perfect OLD Philips logo, 4UX base.
EQUIVALENT: RGN2004 = 4655 = WE52 = PV4200 = DW4 / 350 = 75301 = VG3016 = DW4 = R4200 = G4200 = G2004 = VG3512_Seibt = FW125 & SUBSTITUTE: 4R2_Ultron = DE3_Oxytron = DG500-120 = DW4 / E24 = G500-120 = DW4 G4120_Triotron = GL4 / 2 = P4_Longlife = R0431 = R240 = R561 = RE4200 = V22 = V90 = VG280 = VG3512 = VG420 = VG4200