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PHASE INVERTER & FEED BACK
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It is the phase inversion circuit.
As for feature the classified by channel the return quantity and to be able to change presence setting it is.
R43 499k The resistance which decides the impedance and standard electric potential of the circuit of here and others side R44 100k Resistance for negative feedback. Is decided negative feedback quantity of the power amplifier with such as R45, R46 and R47 R45 1M Resistance of negative feedback quantitative change R46 220k Resistance of negative feedback quantitative change R47 4.7k The resistance which decides the negative feedback quantity R48 10k Phase invertor (phase inversion circuit) important resistance in regard to function. It omits details, but standard value R49 1M Grid bias resistance R50 1M Grid bias resistance R51 470 Resistance for cathode bias. Just a little it is small?? R52 82k Plate load resistance. It has reached the value which about 2 tenths is smaller than R53 in order to take balance R53 100k Plate load resistance. Standard value R54 220k Grid bias resistance of output step. Standard value R55 220k Grid bias resistance of output step. Standard value VR13 25k Rheostat for presence. It can set the classified by channel VR14 25k Rheostat for presence. It can set the classified by channel C35 470p The condenser which adjusts the return quantity. A little high settles C36 0.1u Condenser for presence C37 22u Condenser for DC cutting. You do not happen to see the amplifier which attaches this excessively C38 0.022u Phase invertor input coupling condenser. Fc is low C39 0.1u Important condenser in regard to function of phase invertor. The condenser in order grid it grounds to operate U12 C40 47p For phase revision? C41 0.1u Coupling capacitor for output step C42 0.1u Coupling capacitor for output step SW17 * Transfer in channel SW18 * The switch which changes the negative feedback quantity. When the negative feedback quantity is changed, low damping of the limits and thickness of sound etc change SW19 * Similarly the negative feedback quantitative selector switch SW20 * One for presence. Transfer in channel switch
