6Z4

Rectifier — UX5

Known Equivalents & Substitutes

84CV619CV2548VT-84

Similar Tubes (Not Drop-In Compatible)

6X5GT

6.3V heater full-wave vacuum rectifier with similar current rating — Octal base, not pin-compatible with UX5

6ZY5G

6.3V heater full-wave vacuum rectifier, Octal base — lower current (40 mA) and lower Vdrop (18V)

Electrical Specifications

Absolute Maximum

Anode Voltage (max)AC Voltage per Plate (max RMS, C-input)325V

Heater-to-Cathode Voltage (max)Max DC Heater-to-Cathode Potential450V

Rectifier

Peak Inverse VoltagePeak Inverse Voltage (max)1,250V

Voltage Drop (typical)Voltage Drop (at 60 mA DC)20V

DC Output Current (max)

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.5A

Notes

The 6Z4 is the same tube as the type 84, renumbered under the 6-series heater voltage naming convention. Often marked as 84/6Z4 or 6Z4/84.
Originally developed by Sylvania, first marketed by Philco in March 1933.
Tube voltage drop at 60 mA DC per plate: 20V.
With condenser input filter: Va_max=325V RMS per plate, Idc_max=60 mA, effective plate supply impedance 65 ohms per plate.
With choke input filter: Va_max=450V RMS, Idc_max=60 mA, minimum input choke 10 henrys.
When filter condensers larger than 40 µF are used, additional plate supply impedance may be necessary.

Pin Layout — UX5

1Anode 1 (Plate 1)

2Heater

3Anode 2 (Plate 2)

4Heater

Socket-Compatible Tubes ⚠ Not electrically compatible

References

DC Output Current (max)

60mA

Peak Anode Current (surge)Peak Plate Current per Plate (steady-state)180mA

Internal ResistanceEffective Plate Supply Impedance per Plate (C-input)65Ω

Cathode