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2017-01-15 18:47  
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1-watt phonograph amplifier for ceramic cartridges with 16-ohm speaker. See table for component values. Sensitivity is approximately 450 mV. The gain of this amplifier is determined by (R7 + R10)/R5. To alter the gain, change R5 and hold (R7 + R10) between 1M and 2.2M. Bass boost can be eliminated by removing C4 and replacing (R7 + R10) with a fixed resistor value at 2.2M (courtesy GTE Sylvania Incorporated).