Caveat:

Only decent tubes (radio valves) which are still made are russian--aren't they?

John

"Caveat Lector" wrote in message
news:IsrGe.22435$HV1.3739@fed1read07...
Thank you - curiosity satisfied.
Just curious as how often these are used today
I do know about colpitts, hartley, pierce, wien, clapp, TGTP, relaxation,
crystal, negative resistance, dynatron, etc
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.

John Smith wrote:

Caveat:

Only decent tubes (radio valves) which are still made are russian--aren't they?

John



Oh my God!! Does that mean that my old friend, DeForest, has gone out
of business??