B4 Argon-filled Voltage Regulators

S130 voltage regulator

S130 voltage regulator
Cossor S130
(CV 1731)
2-electrode voltage regulator.
130 V (nominal)
5 - 75 mA
B4 base

Photographs on left:
Andy Cowley
M1EBV 2008

Glow discharge in the bulk gas is obtained by subjecting the tube to the strong electric field of a self-resonating coil. The coil shown here is resonating at about at 25 MHz, slightly lower than its natural frequency due to the stray capacitance of nearby objects. The cathode (outer electrode) of the tube has been earthed to the shield of one of the cables connected to the induction coil. This increases the field gradient and enhances the glow. For more information on this setup see coil resonance experiments.

Close-up of the glowing tube with camera adjusted to avoid over-exposure. The magenta colour is typical of a low-pressure argon fill.

VS110 voltage regulator
VS110 voltage regulator
Voltage regulator with auxiliary priming anode.
120 V nominal
Current range 6 - 75 mA for 120 ±5 V
Strike voltage: 180 V
Equivalent to S130P

Photographs on left:
Andy Cowley
M1EBV 2008

Bulk gas discharge at radio frequency. Obtained in the same way as for the S130 (above). It's a fair bet that the gas fills for both tube types are exactly the same.

S130P (CV45)
Equivalent to ETL GTR120A/S (which also meets CV45 spec.)
Voltage regulator with auxiliary priming anode.
120 V nominal ( 115 - 135 V)
75 mA voltage regulator
ETL datasheet .
S130P base connections
S130P, CV45 S130P, CV45 S130P, CV45
Photographs above: Andy Cowley M1EBV 2008.

S130p operating at 20 mA

S130P (CV45) operating at 20 mA DC with a 2.2 kΩ ballast resistor. The voltage across the electrodes is 107 V. The main anode at the centre is made from metal gauze. The priming anode is simply a wire brought close to the cathode.

Click on image to enlarge in a new wondow.

As with all of the tubes shown on this page, glow colour is characteristic of Argon.

Discharge Tubes
Coil Resonance Experiments

© D. W. Knight 2013, © Andy Cowley 2008.