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5Z3 — Rectifier, UX4 | Tubeofile | Tubeofile
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5Z3
Rectifier — DHT — UX4
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Data: High
High quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
CV1861
VT-145
Similar Tubes (Not Drop-In Compatible)
5U4G
Octal-based equivalent with identical ratings and characteristics — not pin-for-pin compatible due to different base (UX4 vs Octal)
5X4G
Octal-based equivalent with identical ratings — different base type and pinout
80
Same UX4 base but lower current rating (125 mA vs 225 mA) and lower filament current (2.0 A vs 3.0 A)
83
Same UX4 base, mercury-vapour rectifier — much lower voltage drop (15 V vs 58 V) but requires controlled warm-up and has limited life
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
AC Voltage per Plate (max RMS)
550
V
Rectifier
Peak Inverse Voltage
Peak Inverse Voltage
1,550
V
Voltage Drop (typical)
Voltage Drop (at 225 mA DC)
58
V
Max C-input Filter Capacitor
Max C-input Filter Capacitor
40
µF
Notes
Directly heated (filament cathode) — observe heater warm-up time before applying B+ to protect the tube and filter capacitors.
Voltage drop of 58 V at 225 mA DC per plate.
With capacitor-input filter: max 450 V RMS per plate, 225 mA DC output, 75 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.
The 5Z3 is the direct 4-pin predecessor to the octal 5U4G — electrically identical. Replaced by 5U4G when the industry moved to octal bases.
Pin Layout — UX4
1
2
3
4
1
Anode 1 (Plate 1)
2
Filament
3
Anode 2 (Plate 2)
4
Filament
Socket-Compatible Tubes
⚠ Not electrically compatible
274A
80
81
82
83
83V
References
https://frank.pocnet.net/sheets/127/5/5Z3.pdf
Peak Anode Current (surge)
Peak Plate Current (per plate)
675
mA
Max DC Output Current (total, not per-anode)
Max DC Output Current
225
mA
Min Series Resistance (C-input)
Min Total Effective Plate Supply Impedance (C-input, per plate)
75
Ω
Heater
Heater Voltage
Heater Voltage
5
V
Heater Current
Heater Current
3
A