Alberto, Thanks, I did look at them but all they seemed to carry was a 3SK121Y, and when I compared datasheets the 3SK121Y did not quite match the 3SK121. I have, however, located some 3SK121 GaAsFet MES FET's at www.electronicsurplus.com for $3.00, although there is a $15 order minimum. I bought five so now I will have 4 spare 3SK121's !!! 73, Paul W2EC