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[AMPS] 6m amp

To: <>
Subject: [AMPS] 6m amp
From: (Rich Measures)
Date: Sun, 14 Feb 1999 06:35:26 -0800

>I think the efficiency of my homebrew 6m 8877 amp is 
>lower than it should be (currently about 50 %), and am
>looking for some suggestions on how to improve the

?  What is the resistance of your termination R when measured with a DMM?
>The amp runs about 2800 V key down at 1 amp, with 50 mA
>of grid current, into a 50 ohm load.  Idling current 
>(set with a 12V Zener) is about 75 mA.  The plate 
>circuit is a Pi-L network patterned after Lauren Libby's
>(W0LD) HR article from July 1986, using a vacuum variable
>tuning capacitor, 3/16" copper tubing for the coil,...

?   Due to skin effect, the circumference of conductors needs to be 
greater as f increases.  IMO, for good tank efficiency, 3/16" tubing is 
ok for an 8877 on 160m.  For 10m, it is not.  

-  later, Arliss


R. L. Measures, 805-386-3734, AG6K,  

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