[Elecraft] OT: modifying your amp for lower drive requirement

[k.igor at comcast.net]

"The Ameritron ALS-600 has about a 15 ohm input impedance.  Then they put a 
series 35 ohm resistor for matching and reducing gain." 


This is exactly right. The MRF150 MOSFETs used in ALS600 are rated at 20dB. I know people who homebrewed similar amplifier without series resistor and have full 20dB of gain - no problem whatsoever, stable like a rock. 



Igor, N1YX