[TenTec] Source or Substitute for Argonaut 509 Final TransistorsPT3647?

[Stuart Rohre]

There are a number of silicon transistors used to substitute for PT devices. 
Look up Motorola 5 and 10 watt RF transistors, or some of the Japanese 
numbers.  You want to match the collector voltage maximum rating and the 
same sand state material, silicon; the power rating, and the gain; as well 
as ft of the transistor.  You want an ft higher than the highest band of the 
rig.  This is a  5 watt final, right?  Probably uses 2 transistors?  I think 
one of the Moto numbers is a 2N3553??  (I have some of the digits but am not 
sure of the sequence.)

Have you phoned Ten Tec to see if they can sell you a set?

Stuart
K5KVH