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The Dynaco ST-70 is one of the most popular tube amplifiers ever. First released in 1959, it's still sought after by hi-fi enthusiasts today.

Photobleaching effects of radiation-induced darkening in phosphosilicate Erbium-Ytterbium co-doped fibers with different laser wavelengths of 532 nm, 633 nm, and 1080 nm were studied. Both 532 nm and ...