Full-wave rectifier with same heater voltage but Noval base — not pin-compatible
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Max AC Voltage per Anode (RMS)350V
Rectifier
Peak Inverse VoltagePeak Inverse Voltage1,000V
Voltage Drop (typical)Tube Voltage Drop (estimate, EZ40 family)17V
Max DC Output Current (total, not per-anode)Max DC Output Current90mA
Notes
The EZ11 uses the Rimlock (B8A) base, which was Philips' standard before the transition to Noval. The Rimlock base has 8 pins with a metal locating ring.
Brans Vademecum lists the EZ11 in table IId alongside AZ31, EZ1, EZ40, EZ41, 5Y3G/GT, 5Y4G/GT — these share similar function but differ in base and/or heater voltage.
The 6V4 is the American designation. CV number not assigned for this type.
Sams substitution guide lists 6V4 as the substitute.
Vdrop ≈ 17V estimated from the closely related EZ40 (Vh=6.3V, Ah=0.6A, Idc_max=90mA, Vdrop=17V per datasheet) which is electrically near-identical. The Telefunken EZ11 Funkwerk Erfurt datasheet (frank.pocnet.net /076/e/EZ11.pdf) describes a different car-radio variant with 0.29A heater and 60mA rating — it is NOT the Philips mains EZ11 this entry represents. For the authoritative Philips EZ11 Vdrop, consult the Philips Mullard datasheet directly if a precise value is needed.
Pin Layout — Rimlock
1Anode 1
2No Connection
3Heater
4
Socket-Compatible Tubes ⚠ Not electrically compatible