LF: Re Xtal osc. "delta emitter" tuning

["Lawrence Mayhead" <laurie@g3aqc.freeserve.co.uk>]

Yes Bob I realise I am stretching it a bit hence the rather extream
variation in emitter resistance.
However it works for my purposes and no doubt others would like a simple
means of getting a "fine" adjustment.
Regarding the mechanism behind your idea, is it possibly a form of  "Miller"
effect as in valve technology.
Does the base emitter capacitance change  with a change in emitter current?
Perhaps one of the more knowledgeable members of this group could offer an
opinion.
Once again thanks, 73 Laurie.