[Amps] Rm resistor

[R.Measures]

On Dec 14, 2004, at 4:23 AM, Steve Thompson wrote:

> On Tuesday 14 December 2004 12:11, you wrote:
>> This applies to grid-driven Class AB1 amplifiers when they are being
>> neutralized, but not to g-g Class AB2 amplifiers.
>
> The question was whether a midpoint resistor was needed when tuning a 
> PI-L
> network - surely it isn't whatever the amplifier configuration.
>
There are numerous ways to tune a Pi-L or a Pi, tank to achieve a 
match, but the resultant Q could be far off of the design goal.  The 
foundation of tuning any tank is to first set C-Tune to establish the 
design Q at the frequency of tuneup.   Eimac recommends a Q of 10 - 15.

> Steve
>
>>
>> On Dec 14, 2004, at 1:16 AM, Steve Thompson wrote:
>>> On Monday 13 December 2004 20:26, Luca wrote:
>>>> Hi All
>>>>
>>>> For the Pi or PiL  adjustaiment whit the swr analyzer ,it's 
>>>> necessary
>>>> to
>>>> place  a non-inductive resistor egual to the plate impedance,from 
>>>> the
>>>> anode
>>>> tube and the chassis ground. I would like to know if in the PiL case
>>>> ,for
>>>> the best result, it's necessary to place also the non-inductive
>>>> resistor
>>>> egual to RM value ,for example 300 ohm, from the load variable
>>>> capacitor to
>>>> the chassis ground.
>>>
>>> No. The resistor from the anode to ground is the only one you need.
>>>
>>> Steve
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>>
>> Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
>
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org