5T4

Rectifier — DHT — Octal

Known Equivalents & Substitutes

CV1846VT-114

Similar Tubes (Not Drop-In Compatible)

5R4GY

Same Octal base, higher voltage rating (750 V vs 450/550 V) but higher Vdrop (67 V vs 45 V)

Same Octal base and pinout, same max voltage — 5U4G has higher filament current (3.0 A vs 2.0 A) and slightly different Vdrop characteristics

5X4G

Electrically similar but different Octal pinout (5Q vs 5T basing)

Philips interchange lists GZ34/5AR4 as replacement — much lower Vdrop but indirectly heated; verify circuit compatibility

Electrical Specifications

Absolute Maximum

Anode Voltage (max)AC Voltage per Plate (max RMS)550V

Rectifier

Peak Inverse VoltagePeak Inverse Voltage1,550V

Voltage Drop (typical)Voltage Drop (at 225 mA DC)45V

Max C-input Filter CapacitorMax C-input Filter Capacitor40µF

Notes

Directly heated (filament cathode) — observe heater warm-up time before applying B+ to protect the tube and filter capacitors.
Metal-shell envelope provides built-in shielding — the shell is internally connected to pin 1 (ground).
Voltage drop of 45 V at 225 mA DC per plate.
With capacitor-input filter: max 450 V RMS per plate, 225 mA DC output, 150 Ω total effective plate supply impedance per plate.
With choke-input filter: max 550 V RMS per plate, 225 mA DC output, min 3 H input choke.
When filter condensers larger than 40 µF are used, it may be necessary to add additional plate supply impedance.

Pin Layout — Octal

1Shell (Ground)

2Filament

3No Connection

References

DC Output Current (max)DC Output Current (max)225mA

Peak Anode Current (surge)Peak Plate Current (per plate)675mA

Min Series Resistance (C-input)Min Total Effective Plate Supply Impedance (C-input, per plate)150Ω

Heater

Heater VoltageHeater Voltage5V

Heater CurrentHeater Current2A

Anode 2 (Plate 2)

5No Connection

6Anode 1 (Plate 1)

7No Connection

8Filament