• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Zobel for ringing OPT 8010Hz

Pics of FR system with and without ringing OPT
 

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Felipe, it's no measurements. It's shot to the dark.
"I see this!"
"What is it?"


Who knows .... with probability 50% it's the neighbour's LED lamp ... or something... or UFO. 😁

Measurement: define the source, define the DUT (device under test), define the load, define the measuring method (with correct measuring set, which is capable to measure specified parameters), define the expected result.
 
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