CharterOak SA538B Tube Microphone
Front End Audio acquires previously owned gear through our Buy-Back program. You can purchase used gear at a great price but there are no manufacturer warranties with these items. These items have been inspected and/or tested by our staff to make sure each one is in working condition and comes with our commitment to service. This CharterOak SA538B look/function great and includes everything as if it was brand new.
The CharterOak SA538B Tube Microphone is an affordable, high quality alternative to other condenser microphones in its class. Its sonic integrity, extreme durability, overall design simplicity, and serviceability make it an attractive option to any of the condenser microphones of its type currently available. The CharterOak SA538B is a dual diaphragm vacuum tube condenser microphone with side terminated capsule. Nine (9) pick up patterns are switchable. The high standard of quality and affordability of the CharterOak SA538B have been achieved through an extended period of research and development, including beta testing by a wide variety of end users. The parts of the CharterOak SA538 are machined from solid brass and high quality electronic components are used throughout.
The process of creating a CharterOak SA538B Condenser Microphone is started by hand under the strict supervision of CharterOak personnel. Under that supervision the parts are quality checked and assembled at our facility in Connecticut. The microphones are finished and the parts are quality checked a second time by experienced engineers. The process involves a seven (7) day burn in of the vacuum tube and no less than ½ hour spent with each microphone in a studio environment. Careful listening tests employ high quality microphone preamplifiers and high resolution monitoring systems. Quality checks on every component of each kit complete the process. It is only after this exhaustive finishing and quality control process is complete, that an SA538B will be cleared for sale to the customer.
From the research and development to the delivery of every CharterOak SA538B, it is this attention to detail that makes the SA538B truly unique in its class.
CharterOak SA538B Tube Microphone Specifications
- Acoustic Operating Principle: Pressure Gradient
- Diaphragm: Dual 1.07" 6 micron thick gold sputtered Mylar
- Frequency Response: 25Hz-20kHz
- Sensitivity: 12mV/Pa 0dB=1V/Pa@1kHz
- Polar Pattern: Cardioid, Omni, Figure-8, and intermediate stages selectable from power supply
- Impedance: < 200 Ohms
- Recommended Load: > 200 Ohms
- Input Noise: 20dB A weighted IEC651
- SPL: 125dB for 0.5% total harmonic distortion @ 1kHz
- Power: Custom supply 115V or 230V operation with IEC type 2 AC Cable
CharterOak SA538B Tube Microphone Includes
- SA538 Tube Microphone
- Locking Flight Case
- Power Supply
- Shock Mount
- Appropriate Cables
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