>Rich says:
>
> >>Something I don't understand here. How come grid driven high mu
> >>triodes can produce lots of low distorted power in audio service?
>> >
> >1. grid current helps to increase peak anode current.
> >
>> Most of the high level plate modulation I hear on the ham bands sounds
>>somewhat distorted.
>
>Just funny that the broadcasters managed OK using audio amps with grid
>current.
>
Broadcast quality amplifiers typically use negative feedback (NFB) to
reduce distortion. If distortion exceeds c. 1 part in 8k, the human ear
can detect it.
>And don't let us forget the people like Collins, Marconi, Racal, Brown-Boveri
>and so on who very successfully used linear AB2 PA stages.
>
The Collins plate-modulated MF transmitter that I am familiar with
employs NFB. Every Class AB2 g-g RF power amp. employs NFB.
>
cheers, Peter
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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