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The QS92/10 is a B7G based 90 Volt voltage stabiliser. Like all electronic devices there is a spread in actual performance values between samples. Jacob presents a series of current readings for two outwardly identical tubes.
The voltage stabiliser attempts to hold the voltage across the tube constant for a range of currents through the tube. The stabiliser is operated with a series resistance to limit the current. When the HT is first applied the voltage has to be above the striking value for the discharge to be initiated. Once the discharge is established the stabilised voltage is a lower figure, normally some thirty Volts lower.
mA |
1.0 |
2.5 |
5.0 |
8.0 |
V(v1) |
92.0 |
92.3 |
93.3 |
94.2 |
V(v2) |
89.5 |
89.7 |
90.7 |
91.5 |
For the most demanding applications, such as oscillators, the tube would be run at a near constant current. A stabilised power supply would use the stabiliser with a constant load and feed the reference voltage to a voltage amplifier and use this amplifier to operate a series pass valve.
See Valve Power Supply for more details.
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