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SPRAGUE TO-5 AND -6 CALIBRATION (with notes on TO-4 similarities) CAPACITANCE MEASUREMENT CALIBRATION by DavidK Note: Some models may have fixed or variable resistors in the R12 or R14 positions to expand the ends of the ranges. If your dial settings do not track properly, it may be helpful to add trimmers in these locations.
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R14, R15, R16, and R17 is 120000 ohms. If you apply 600 volts across 120K, you draw 5 mA of current. In the case of the TO-6, a small portion of the 5 mA flows through the meter, and the remainder through the 5 mA shunt.
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2. The C3 reference capacitor (.02) is C-8 on the TO-5, C-4 on the TO-4, and C-9 on the TO-6. 3. The C4 and C5 reference capacitor (2 UF) is C-9 on the TO-5, C-5 on the TO-4, and C-10 on the TO-6.
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