I have begun the process of breaking down some of my old amps(Made in the 1990's) that I do not plan to run anymore. All my amps have authentic toshiba 2SC2879 transistors that were made in Japan. The only thing I can guarantee is that these are authentic Toshiba 2sc2879's made in Japan and that they are in working order no more no less and no returns. Sold as is. These transistors are in used condition. Asking $150.00 pair with $12.00 shipping within the USA