It is commonly assumed that the Russian 5Ц4С (5U4S) rectifier is equal to the western 5Z4G, and its true! The only difference compared to a vintage Brimar is a slightly higher peak inverse voltage at 1400v in stead of 1350v for the 5Ц4С.
The GZ30 is also an equivalent with the same specifications as 5Z4G. Jogis Röhrenbude has a PDF with a scan of an original datasheet. Another datasheet is availible from http://www.gstube.com/scan/302_1.gif
There is some confusion concerning the names of this tube.
The Cyrillic letter Ц looks similar to Latin U but is pronounced Ts like in "cats"
The Cyrillic letter C is identical to Latin C but is pronounced Es like in "escape"
The tube is translated as 5U4C or 5U4S but should be called 5TS4S.
It is not equal to the western 5U4G
5Ц4С rectifier, double-anode tube(This data is based on google translate and cleaning up the text to some degree. Please suggest better translations.)
I have found a test of rise time for 5Ц4С. After a cold start for 0-4 seconds there is no anode voltage, after 4 to 9 seconds rising anode voltage. 10 seconds full anode voltage. Does anyone have rise time data for the 5Z4G or GU30? - please post a comment if they differ.
Voltage drop data have been difficult to find. Generally it is 10-15% of the anode voltage. If you know how much voltage is dropped over the tube please leave a comment :-)
NOTE!:¨There is a discussion on DIYaudio about the validity of the anode resistance value presented in the table below. A required resistance in the anode circuit of 4.7Kohm is much to high for normal powersupply duty, for instance in tube amplifiers.
If anyone has used this tube and has practical knowledge of the correct value please leave a comment.
Rated electrical data
|Heater voltage, V||5|
|Variable effective stress of the secondary winding of the transformer, V||2х500|
|Resistance in the anode circuit, Ohm||4700|
|Capacitor filter, uF||5|
|Heater current, A||2|
|The rectified current, mA||122|
|The rectified current when the heater voltage 4.5 V, mA||100|
Maximum electrical quantities
|Most heater voltage, V||5.5|
|The smallest heater voltage, V||4.5|
|The greatest amplitude of the reverse voltage of the anode, in||1350|
|The highest average value of the rectified current, mA||125|
|The greatest amplitude of anode current, mA||375|