[Amps] gg feed through power

[Carl]

Trying to decipher Orr at times is a task.

Is he trying to say that the tube absorbs 90% and feed thru 10%?

If so wouldnt loading for optimum grid current in the spec sheet accomplish 
that? Sort of by default?

Ive never read that version, which edition were you reading?

Carl
KM1H



----- Original Message ----- 
From: <TexasRF at aol.com>
To: <amps at contesting.com>
Sent: Tuesday, March 30, 2010 7:13 PM
Subject: [Amps] gg feed through power


> After more reading in the Orr book, I discovered a discussion of feed
> through power in a cathode driven amplifier.
>
> We have all heard about the drive power adding to the output power. Orr
> says, and I am paraphrasing here, that a PORTION of the drive power is 
> added
> to  the output power. He goes on to say that the greater the ratio of 
> drive
> power to  the feed through power, the better the imd performance. He 
> further
> suggested  that the optimum feed through power for best imd performance is
> about 10%.
>
> Heck, 10% of a 100w drive level is insignificant and might as well be
> ignored.
>
> He did not describe how one goes about attaining the 10% feed through 
> level
> and I suspect there is no control of this. Perhaps you get what you get
> with a  given tube?
>
> He also wrote about the improved imd performance due to the heavy negative
> feed back inherent in cathode driven amplifiers compared to grid driven;
> often  in the 10 to 15 dB range of improvement.
>
> We have always heard this to be so; at least that old saying is  correct.
>
> 73,
> Gerald K5GW
>
>
>
>
>
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