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
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