Voltage Drop (typical)Forward Voltage Drop (read from AZ41 Ia/Va curve at 35 mA per plate)23V
Max C-input Filter CapacitorMax C-input Filter Capacitor50
Notes
Directly heated (filament cathode) — observe heater warm-up time before applying B+.
4.0 V / 0.12 A heater — designed for European 4 V heater supply standard, not compatible with 5 V or 6.3 V American heater circuits.
Maximum DC output current depends on transformer voltage: 70 mA at 2x300 V, 60 mA at 2x400 V, 60 mA at 2x500 V.
Maximum C-input filter capacitor: 50 µF at 2x300 V and 2x400 V, 50 µF at 2x500 V.
Minimum total series resistance (Rt) per plate: 2x100 Ω at 2x300 V, 2x150 Ω at 2x400 V, 2x200 Ω at 2x500 V.
Rimlock (B8A) base has a locating key for correct insertion — 8 pins arranged in a circle with a central locating spigot.
Peak Inverse Voltage is not explicitly stated in the Telefunken/Philips AZ41 datasheet; PIV=1414 V is derived from the standard full-wave capacitor-input relation PIV = 2 × √2 × Va_max (500 Vrms). Matches the convention used for AZ12, UU4, UU5, EZ41 in this repo.
Vdrop=23 V is read from the AZ41 single-plate I/V characteristic (Philips datasheet page 2, Ia per anode vs Va, 0-60 V / 0-100 mA) at 35 mA per plate (= Idc_max 70 mA / 2 for full-wave). The datasheet does not state a discrete Vdrop value.
Pin Layout — Rimlock
1Anode 1 (Plate 1)
2No Connection
3Filament
4
Socket-Compatible Tubes ⚠ Not electrically compatible