[AMPS] More Plus: Drive derived screen voltage

[Ian Roberts]

Colin, 
It would have helped if you had quoted the URL to the initial source
(RCA.COM?)

Lamb wrote:

> However, they do have an interesting comment in 4.4.4  (Effects of Screen
> Voltage)  "... Usually, the lowest value of d.c. screen voltage compatible
> with a given power output will produce the lowest intermodulation
> distortion."  

This directly questions the business of highly regulated screen voltages
- amps are set up for best IMD at full power (presumably) vs a "stiff"
screen voltage at that power level. According to the above, the IMD at
lower power levels could be fairly indifferent, unless the screen
voltage regulator is ganged to the "given power output that will produce
the lowest intermodulation distortion".

> The G2DAF follows this statement closely by varying the screen
> voltage with the power output.
> 
> The big concern regarding screen voltage is for it to drop as the drive and
> output increases.  

What about "remain constant" as the drive and output increases (or
decreases)?


> Colin  K7FM

Ian ZS6BTE

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