Re: OT: modifying your amp for lower drive requirement

Posted by k.igor on Dec 21, 2010; 6:08pm
URL: http://elecraft.85.s1.nabble.com/OT-modifying-your-amp-for-lower-drive-requirement-tp5854009p5857473.html



"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

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