True bass boost. On the left is an input terminal which connects to the grid of a triode, 12 A X 7. The grid goes to ground through a 470 k ohm resistor. The cathode goes to ground through a 1.8 k ohm resistor. The plate goes to B plus two through a 100 k ohm resistor. The plate also connects to one end of a 0.1 microfarad capacitor. The other end goes to one end of a 470 k ohm resistor. The other end of the resistor connects to a point labeled output. The output point goes through a 47 k ohm resistor then a 0.01 microfarad capacitor to ground. The junction of the 47k and 0.01 connect to both the top and wiper of a 500 k ohm pot. The bottom is grounded. End verbal description.
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