FM3

About the FM3

The Dynaco FM-3, also known as the Dynatuner FM-3, is a vacuum tube stereo FM tuner highly regarded for its sound quality and sensitivity. It features a superheterodyne circuit with an RF stage and an intermediate frequency of 10.7 MHz. The tuner uses 11 tubes including ECC85, 6AT8A, 6BA6, EMM801, ECC83, 6BL8, and EZ80. It has an analogue tuning scale and supports mono and stereo FM bands. The FM-3 is known for its usable sensitivity of 4 microvolts and a signal-to-noise ratio of 70 dB at 100% modulation. Modifications and upgrades are common among enthusiasts to improve power supply, capacitor and resistor quality, and equalization circuits, enhancing its performance and reliability. The unit runs warm due to tube operation and often requires careful alignment and maintenance. It includes a dual indicator EMM-801 tuning eye and stereo indicator. The FM-3 is a classic piece of high fidelity audio equipment cherished by vintage audio collectors and audiophiles.