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5C3S — Rectifier, Octal | Tubeofile
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5C3S
Rectifier — DHT — Octal
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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.
↗ Radiomuseum
Known Equivalents & Substitutes
5AS4A
Similar Tubes (Not Drop-In Compatible)
5U4G
Western functional equivalent with same Octal base — verify heater current compatibility (5C3S draws 3.0A vs 5U4G at 3.0A)
5Y3GT
Lower-current rectifier on same Octal base (125 mA vs 225 mA) — not a direct replacement in higher-current circuits
GZ31
Philips/Mullard equivalent — same Octal base but verify pinout compatibility
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
AC Voltage per Plate (max RMS)
450
V
Rectifier
Peak Inverse Voltage
Peak Inverse Voltage
1,550
V
Voltage Drop (typical)
Voltage Drop (typical)
44
V
Max C-input Filter Capacitor
Max C-input Filter Capacitor
40
µF
Notes
5Ц3С (5Ts3S) is the Cyrillic designation. The Latin transliteration is 5C3S.
Directly heated (filament cathode) — observe heater warm-up time before applying B+.
Russian equivalents reference lists Western equivalents as 5AS4A, 5U4G, GZ31.
Commonly found in Soviet audio amplifiers and radio equipment as the primary rectifier tube.
Same Octal base and pinout as 5U4G — widely used as a substitute in Western amplifier restorations.
Pin Layout — Octal
1
2
3
4
5
6
7
8
1
No Connection
2
Filament
3
No Connection
4
Socket-Compatible Tubes
⚠ Not electrically compatible
5R4
5U4G
5V4
5Y3
5Z3P
GZ32
GZ33
GZ34
References
https://frank.pocnet.net/sheets/084/5/5C3S.pdf
DC Output Current (max)
DC Output Current (max)
225
mA
Peak Anode Current (surge)
Peak Plate Current (per plate)
800
mA
Heater
Heater Voltage
Heater Voltage
5
V
Heater Current
Heater Current
3
A
Anode 2 (Plate 2)
5
No Connection
6
Anode 1 (Plate 1)
7
No Connection
8
Filament