Alek, Did you try increasing Q of the input to ~c 2 to produce a better
flywheel effect,
which becomes a more stable input impedance through a wider drive level
range ?
More capacitance, less inductance on the input.
73
vk4tux
On 13/12/23 20:14, amps-request@contesting.com wrote:
For what it's worth, I have had terrible problems getting the input
matching right on several amplifiers using the VNA, yet when using
normal drive levels, as reccommended in the user/service manuals, tuning
is a breeze. Therefore, I think that there is some truth in the
assertion that tuning at low levels does not work properly.
73, Alek VK6APK
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