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Josephson C725 Operation & User’s Manual

Josephson C725 Manual Online:

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Josephson C725 User Manual
Josephson C725 User Guide
Josephson C725 Online Manual

Text of Josephson C725 User Guide:

  • Josephson C725, JOSEPHSON ENGINEERING • C725 USERS GUIDE Josephson C725 microphones are a new direction for Josephson Engineering, representing a hybrid of our solid-state technology with the dynamic characteristics of a vacuum tube. More than five years of development have gone into perfecting the circuit. The capsule is the current revision of our dual-diaphragm multi-chamber design made since 1989 and used in the C700 and C716 microphones, but is provided with directional pattern control that can be adjusted using a switch on the power supply. Five selectable patterns from omni through cardioid to figure-8 are provided. On the front of the power supply is

  • JOSEPHSON ENGINEERING • C725 USERS GUIDE Microphone circuit The C725 uses a new variant of the cascode circuit that's used with some variation in many of our microphones. In our other mics, the cascode is implemented using two large-geometry junction field effect transistors. In the C725 the same JFET is used for the lower or voltage-gain part of the c

  • Josephson C725, JOSEPHSON ENGINEERING • C725 USERS GUIDE EF86, EF806 or 6267 type. Small variations expected over the life of a tube are automatically compensated by the circuit. Silicone rubber dampers are provided around the tube and must be replaced on the new tube; they control vibration and also protect the tube if the microphone is dropped. Be particularly careful when replacing the tube to not touch the front-end FET circuit which is found on two PTFE (Teflon) standoffs near the tip of the tube envelope. This area must remain absolutely clean

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