Microphone balanced preamplifier

A professional suggestion for those interested in improving sound. The circuit constitutes the part of input mixing console sound from the microphone or source of high level . It can be used on it's own or be multiplied to the number of channels required. It includes all the useful functions such as, phantom power , reverse face, signal attenuation for avoiding distortions from high level signals regulating channel gains and the rest of the stages will be added next stages ,for full mixing console. Attention must be paid to the quality of the materials used. This circuit may used, previous to Parametric EQ circuit.
Microphone balanced preamplifier - schematic

Part List R1-2= 6.8K ohm R16-19= 4.7Kohm C8-11= 10uF25V electrolytic R3= 56Kohm R17-18= 15Kohm C9-10= 47nF 63V MKT 5% R4-6= 2.2Kohm R20-21= 27Kohm C12-13= 47nF 63V ??? 5% R5-7= 220 ohm R22= 22Kohm T1-2= BC560C R8-9= 39Kohm R23-24-25= 47Kohm IC1= NE5532, TL072 R10-11= 2.7Kohm C1-2= 33uF 63V electrolytic S1-5= On/off Sw R12-13= 4.7Kohm C3-4= 680pf ceramic or mylar JF1-2= 3 pin-connector R14= 68 ohm C6= 100uF 25V electrolytic R15= 10Kohm log. pot. C5-7= 120pF ceramic or mylar ?ll Registor is 1% metal film

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