On 11/12/2010 7:52 PM, Hsu wrote: > What new article about RF amplifier in handbook 2011? > They go through the design of an 8877 HF amp, have a construction article on the 3CX1500D7 HF amp (uses vacuum variables for tune and load), and IIRC the 4CX1600B 6-meter amp is the same as in the previous Handbook. 73 Roger (K8RI).