Soviet directly-heated rectifier on same Octal base — higher current capability but different heating type
5Y3GT
Similar full-wave rectifier on Octal base but 5Y3 is directly heated and has higher voltage drop — not pin-compatible
5Y4G
Indirectly heated rectifier on Octal base — similar concept but verify pinout and ratings
Electrical Specifications
Absolute Maximum
Anode Voltage (max)AC Voltage per Plate (max RMS)350V
Rectifier
Peak Inverse VoltagePeak Inverse Voltage1,500V
Voltage Drop (typical)Voltage Drop (typical)25V
DC Output Current (max)DC Output Current (max)120mA
Heater
Heater VoltageHeater Voltage5V
Heater CurrentHeater Current1.5A
Notes
5Ц4С (5Ts4S) is the Cyrillic designation. The Latin transliteration is 5Ts4S.
Indirectly heated rectifier — cathode is heated by a separate filament element.
Often found in Soviet radio receivers and amplifier power supplies.
Despite being cited as a substitute for Western rectifiers like 5Y3, verify pinout and maximum ratings before substituting — the 5Ts4S has its own specific characteristics.