The Argosy uses the following transistors in the final amplifier: 1 x MJE-520 (Q3) 2 x MRF-476 (Q1, Q2) 2 x MRF-477 (Q4, Q5) The hard ones to find will be the MRF-476's and -477's. Cross Ref. for the MJE-520 is an NTE-124 at $2.29 ea. at Mouser -- JT Croteau - W6FO - Canton, GA <>< ARS #2,147 | NoGA-QRP | SEDXC | SECC | ARRL