Negative Feedback Selector- for Dyna-70 & -120 Ultimate ST-70 Audio Systems

Description: Miller Audio introduces our new Negative Feedback Selector (NFS) upgrade for Dyna-70 and Dyna-120 Amplifiers and VTA ST-70's! Usual questions such as: “What is Negative Feedback?” and “Why do I need a Negative Feedback Selector?” often follow. Therefore, the following is some background on what Negative Feedback (NFB) is, how it’s used, and why you should consider this upgrade if you already have a Dyna-70 Ultimate Upgrade ST-70 amplifier. The Dynaco ST-70 is designed with 4-, 8- & 16-Ohm speaker outputs. As with most audio amplifiers, the ST-70 uses a signal called Negative Feedback (NFB), taken from the audio output, which is then fed back into the audio input circuit of each channel to correct for distortion. NFB is a “control loop,” and is always working to correct the audio signal, to minimize distortion. A compromise Dynaco made was to use the 16-Ohm output for the NFB signal for all speaker impedance's. This is fine if one is using 16-Ohm speakers, but what if you are using 4- or 8- ohm speakers? The 16-Ohm NFB circuit is not optimized for the lower speaker impedance's, meaning the distortion products are not properly compensated for, which can lead to distortion in the amplifier and in extreme cases can impact overall frequency response and bandwidth performance. The NFB Selector corrects this by using a correction circuit that has all 3 speaker impedance's available to properly compensate for NFB, providing the proper feedback signal correction for any 4-, 8-, or 16-Ohm speaker. One simply sets the selector for the desired speaker impedance and your Dyna Ultimate Amplifier will provide the lowest distortion signal correction for the speaker impedance used. It’s simple, easy, safe, can be done in a matter of minutes, and does not require one to work inside a powered amplifier; installation and NFB change can be made with no power to the amplifier. Does it matter? / Does it really work? We promise, if you are using the 16-Ohm Output from the A-470 as your NFB signal source in your Dyna-70, you will hear & sense an immediate improvement in sound output if you install the NFS system in your amplifier and your audio system speakers are 4-or 8-Ohms. If you use a 16-Ohm speaker system, continue to use the 16-Ohm terminal for both NFB and to drive your 16-Ohm speakers. However, remember to use the NFS to select the proper NFB signal should you change from 16-Ohm speakers and set for the speaker impedance you will be using, whether 4- or 8-Ohms. The NFS upgrade kit comes with 2 PCB’s for left & right channels, as well as all components to assemble and install the NFS. We have the NFS upgrade kit in stock and ready for installation in your Dyna amplifier- only $39.95 + S&H. NOTE: The NFS Upgrade Kit is not compatible with a standard Dynaco ST-70 with a stock PC-3 PCB and 7199 tubes. The NFS Kit is designed for use with the Miller Audio Dyna-70 & Dyna-120 Ultimate audio systems. Our NFS kit is also compatible with upgraded ST-70's that use the VTA / tubes4hifi.com PC-3 PCB with 12AU7 or 6SN7 tubes. From Miller Audio, "We Bring the ST-70 into the 21st Century"

Price: 39.95 USD

Location: Dallas, Texas

End Time: 2024-09-17T14:42:37.000Z

Shipping Cost: N/A USD