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5C4S — Rectifier, Octal | Tubeofile
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5C4S
Rectifier — Octal
···
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↗ Radiomuseum
Known Equivalents & Substitutes
5Z4
5Z4G
5Z4GT
GZ30
CV1863
U52
Similar Tubes (Not Drop-In Compatible)
5C3S
Soviet 5U4G equivalent — higher current rating and directly heated filament, different application
5Y3
Similar rectifier but directly heated and different voltage/current ratings
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
AC Plate Voltage (RMS, max per plate)
375
V
Rectifier
Peak Inverse Voltage
Peak Inverse Voltage
1,400
V
Voltage Drop (typical)
Tube Voltage Drop (approx)
24
V
DC Output Current (max)
DC Output Current (max)
125
mA
Heater
Notes
Cyrillic designation: 5Ц4С. Russian_equivalents.json confirms: 5C4S ≈ 5Z4, 5Z4G, GZ30.
Foreign_substitutes.json also lists: 5C4S → 5Z4G, 5Z4.
Indirectly heated cathode — unlike the 5U4G/5C3S which has a directly heated filament. This provides faster warm-up and more consistent operation.
Lower current rating than 5C3S: typically 125mA DC output maximum.
The user listed '5Ц4С' in Cyrillic — this is the same tube as 5C4S in Latin transliteration.
Pin Layout — Octal
1
2
3
4
5
6
7
8
1
No Connection
2
Heater
3
No Connection
4
References
https://www.radiomuseum.org/tubes/tube_5c4s.html
Heater Voltage
Heater Voltage
5
V
Heater Current
Heater Current
2
A
Absolute Maximum
Anode Voltage (max)
AC Plate Voltage (RMS, max per plate)
375
V
Rectifier
Peak Inverse Voltage
Peak Inverse Voltage
1,400
V
Voltage Drop (typical)
Tube Voltage Drop (approx)
24
V
DC Output Current (max)
DC Output Current (max)
125
mA
Anode (plate 1)
5
No Connection
6
Anode (plate 2)
7
No Connection
8
Cathode / Heater