User's Manual
Table Of Contents
- Introduction
- SF-24V Vacuum Tube Stereo Ribbon Microphone
- Active & Vacuum Tube Ribbon Technology
- Description
- Applications
- Ribbons in the Digital World
- User Guide
- Using the SF-24V Vacuum Tube Stereo Ribbon Microphone
- Operation
- Power Supply Input Module
- Fuse Replacement
- Voltage Changeover
- Amplification Considerations
- Stereo Microphones and Ground Loops
- Equalization and Ribbon Microphones
- Hum, Noise and Mic Orientation
- Microphone Techniques
- General Tips for Using the Royer SF-24V
- Specialized Stereo Recording Techniques
- Classic Blumlein Technique
- Mid-Side (M-S) Technique
- Care and Maintenance
- Care for the Satin Nickel Finish
- Care for the Optional Optical Black Finish
- Care for the SF-24V’s African Padouk Presentation Case
- Features
- Specifications
- Polar Pattern
- Frequency Response
- Wiring Diagram
- Warranty
within the module. Remove the power cord and open the
module door in the same manner as for accessing the fuses.
The drum can be removed with a small pair of needle-nosed
pliers or the thumb and forefinger (Image 5). Rotate the drum
so that the desired voltage appears in the window of the
module (Image 6). Gently push the drum back into position
and close the door. The door will snap shut when fully closed.
It is important to note that changing voltage settings also
requires changing the fuses to different values. The correct
values can be found in the specifications section of this
manual. There is more information on this subject in the
"Power Input Module" section of this manual.
Always connect the microphone to the power supply using the
seven-pin cable before applying AC voltage to the power
supply. Connect the two XLR audio outputs of the power
supply unit to a stereo or two-channel preamplifier. The outputs
are identified as OUTPUT 1 and OUTPUT 2. The upper
transducer is OUTPUT 1 and the lower transducer is OUTPUT
2. With the microphone positioned upright (logo facing sound
source), the UPPER element is RIGHT and the LOWER
element is LEFT, as viewed from the observer's perspective.
Since the SF-24 is active, its low impedance output allows for
long cable runs with minimal affect on the microphone’s
performance. High-frequency response losses and noise pickup
will be minimal even with cable runs up to several-hundred
feet in length.
NOTE:
There are no user serviceable parts in the power supply or
microphone. Leave all servicing of your SF-24V to a qualified
technician authorized to service this product.
Amplification Considerations
Almost any stereo microphone preamplifier (or pair of mono preamplifiers) with nominal gain
characteristics will give excellent results with your SF-24V vacuum tube ribbon microphone.
Unlike standard ribbon microphones, which depend on a proper impedance match to deliver
optimal performance, the input impedance of your preamplifiers will have minimal affect on the
SF-24V’s performance because the ribbon elements are loaded perfectly via the microphones’
internal electronics. Careful consideration should be given to the quality of the microphone
preamplifier. Studio grade preamplifiers usually sound much better than cheaper ones.
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Image 6
Image 4
Image 5