Bonjour Jacques
Cela semble exact;
Tokyo Hy-Power Laboratory was founded in 1975 by Nobuki Wakabayashi JA1DJW in Saitama Prefecture near Tokyo, Japan. Their initial products were antenna couplers for HF bands such as the HC-500 and HC-2500.
In 1977, Tokyo Hy-Power Labs, Inc. was formally established as a developer and manufacturer of linear amplifiers, antenna tuners, etc. for radio amateurs. In 1984 they started to manufacture RF power products for the industrial market.
Cela ne reste pas beaucoup de choix pour des amplificateurs de qualité à transistor abordables similaire aux prix des tubes.
Donc je reste aux tubes pour longtemps...
Réjean