NOTE: Model G Regulators of 115 volt - 60 cycle output serial numbered below 1101,
115 volt - 50 cycle below 1060, and 230 volt - 50 cycles below 2059 used two 6L6-G
tubes instead of RK-49s. Also choke L1 and resistor R1 were not used, and R52 was
20,000 ohms.
ADJUSTMENT OF PITCH
Adjustment of pitch is possible by moving a weight on the vibrating arm. A single
weight is provided for this purpose. Moving this weight toward the center of the arm
raises the pitch, and moving it toward the end w111 lower the pitch. The range of
the pitch adjustment is approximately 430 to 460 for middle A (normally 440). This
pitch may be checked by means of a 60 cycle synchronous clock, which is connected to
the regulator receptacle and compared with any other accurate timepiece.
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