(Fwd) RE: [AMPS] Alpha models: 91B vs. 89

[John Devoldere]

Is anyone use a Pi or a T filter ahead of his dummy load?
73
John, ON4UN

>
>hi morel and "amps" folks,
>
>morel wrote,
>
>> >>Input           Tuned input not req'd   Tuned Input
>> >
>> >Tuned input is expensive but is a "must" not only for purists.
>> >
>
>i have to disagree with that one!  if an amp (triode *or* tetrode) is 
>cathode driven, then morel is 100% correct... but the 91beta is *not* 
>cathode driven.  the exciter drives what is essentially a 50-ohm 
>dummy load, and the amps grids look at the voltage across this load.  
>"tuned input not req'd" is exactly correct.  
>
>73, k6gt
>
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>

----------------------------------------------------------------------------
john.devoldere@innet.be
Call us in all major 1997 contests: ON4UN or OT7T
John Devoldere (ON4UN-AA4OI)
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B-9000 Ghent (Belgium)


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