Treble 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 the top of a 500 k ohm pot. The bottom end goes to a point labeled output. The output point goes through a 47 k ohm resistor to ground. The wiper of the pot goes through a 330 pf capacitor to the top of the pot. End verbal description.
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