Indeed negative resistance it be

A tetrode with grid and plate potentials so arranged that plate current
decreases when plate potential increases.

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--
CL -- I doubt, therefore I might be !






"Fred W4JLE" wrote in message
...
Negative resistance comes to mind...

"Caveat Lector" wrote in message
news:IsrGe.22435$HV1.3739@fed1read07...

Anyone remember the dynatron oscillator? Tetrodes me lads tetrodes.

--
CL -- I doubt, therefore I ask






"Ham op" wrote in message
...
Caveat Lector wrote:

Just out of curousity -- what modern Ham gear uses a Colpitts
oscillator
or a swinging choke ??

Then why ask these questions on a 2005 Ham test ??

Maybe ask about a VCO or a crowbar circuit ??


All of them!!! The reference oscillator in every phase locked loop is
generally a Colpitt's oscillator. I suspect that every oscillator in
the
VCO circuit is also Colpitt's.

By simply asking the question you make the point!!!

The required level of knowledge for a license today is significantly
poorer than 40 or 50 years ago.