On 5/22/2010 1:22 PM, Jim Brown wrote:
> On Fri, 21 May 2010 19:32:43 -0400, Roger wrote:
>
>
>> The screen is the most sensitive tuning indicator and particularly so at
>> the higher power settings.
>>
> So if I watch the screen current, am I tuning for minimum?
>
No.
In the final stages of tuning a Tetrode amp you are peaking the screen
current with the loading control. This peak coincides with maximum
output, or should and is a sharper peak than the output.
If the screen current is excessive, back off on the drive a bit and
retune. The max screen current should also come with minimum grid
current for any specific drive. IOW, increasing screen current decreases
grid current.
73
Roger (K8RI)
> Do I need to watch grid current, or will that take care of itself if the
> screen current is right?
>
> Many thanks for all the great responses, both on and off list. Very helpful.
>
> 73,
>
> Jim K9YC
>
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|