On 12/12/2023 1:37 PM, Alek Petkovic via Amps 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.
Impedances include the tube(s) as active elements, and their
contributions depend on their dynamic characteristics.
73, Jim K9YC
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