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[Amps] ALPHA 77

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Subject: [Amps] ALPHA 77
From: (2)
Date: Sun, 4 Aug 2002 16:16:34 -0700
>> Why would one need to tune for grid-current ?  Minimal grid current does
>> not give a correct tune.  Maximal grid-current does not give a correct
>> tune.  A correct tune is max out with the drive needed to produce 1A of
>> anode current per 8877 -- which coincidentally results in c. 100mA
>> grid-current per grid, which could be seen on a 0-500 scale.  However,
>> there is no need to measure  grid-current on a cathode-driven amp.
>> Grid-driven, yes.
>When I tune an 8877 amp, I tune everything for maximum power out.
>I then tweak the PA loading cap slightly to give a needle-width decrease
>on the wattmeter. I need to see the grid current at this time to make sure
>it goes down and not up when making this adjustment. This slight reduction
>in suds makes a nice increase in clean. 

True, Phil, but the 8877 is so clean that there are no transceivers even 
in the same league.  


-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,  

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