Sonic frontiers sfs 503/6/2024 ![]() ![]() Today we'll be looking at a specimen that has never been restored, oxidized bindings posts left as is, but does have the following tubes which are different from factoryġ) Joint-Army-Navy GE 6550A tubes, biased at 40mA and 50mA With an actual bias meter, you can really tinker with the setup. Modern designs have gone with self- or fixed-bias designs or "fool-proof" turn the knob until the LED light turns on or off. Instead, this is a bias meter which allows you to fine tune the bias of your power tubes by turning a potentiometer. What's great about the SFS-80 for tinkerers and hobbyists is that the front meter is NOT a VU meter which is pretty but not all that useful. The SFS-80 is built around the tried-and-true Dynaco ST-70 platform but with over-engineered transformers and power supplies to handle up to 80 watts per channel. We've seen questionable modifications to the Dynaco ST-70 which measure poorly, though potentially attributable to "questionable" tubes. One of the questions asked is if tube amps are just intended to be distortion factories? Some of the worst measuring devices here are the pricey Carver tube amplifiers. The 2 channel tube line was retired and Anthem focused exclusively on solid-state products and has become the company we all know and love today. Fast forward to 1998 and Sonic Frontiers/Anthem were purchased by Jerry VanderMarel and Scott Bagby, the founders of Paradigm speakers. Generally, Sonic Frontiers focused on tube-based products while Anthem focused on solid-state. As home theater and the DVD era was introduced, Sonic Frontiers established a "budget line" known as Anthem. They began to sell their finished products under the Sonic Frontiers brand and rapidly grew. In the late 80's or early 90's, a Canadian part distributor began to ship DIY kits for tube amplifiers. 70 lbs, all concentrated in the transformers.īelieve it or not, Sonic Frontiers is a company we all know very well. the Sonic Frontiers SFS-80 tube amplifier. Up next on testing gear that would be impossible to ship safely. Sonic Frontiers SFS-80 Tube Amplifier: A "new" benchmark to beat from 1992
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