AMPEXAmpex_plug-in_mic_preamp 维修电路原理图.pdf

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1、Ampex plug-in Microphone Preamp 4010066 The preamplifier is wired so that a variable gain control may be inserted between the two stages. When used with Ampex recorders (AG-440, AG-500, AG-600), the record level control on the equipment is so connected, making the preamplifier a variable-gain device

2、 that accommodates a wide variety of professional-quality microphones. The unit can be used to drive any amplifier with a 100K ohm input impedance, at a 0.1 VRMS level. When so used, the signal input is connected across pins 4 and 8, the unbalanced output is taken across pins 7 and 2 (ground). Power (+24VDC) is connected to pin 5, with pin 2 again as ground. The previously mentioned variable-gain control (100K ohms) is connected across pins 3 and 6. Pin 1 should be connected to the case of the unit, and should also be grounded. (from the Ampex AG-600B user manual)