[Boatanchors] Tube Oscillator Circuit Question

[WA5VGO]

I agree completely. I’ve seen some really rough looking waveforms on BFO’s. As long as you can get a clean beat note, don’t sweat it. 

Darrell

> On Dec 13, 2020, at 12:59 PM, Jacques Fortin <jacques.f at videotron.ca> wrote:
> 
> Hello Scott,
> 
> What you see is normal.
> The BFO tube operates in class C, then it only draws current when the grid
> voltage goes over a given value (it is self-biasing, anyways).
> As you only have a resistive load on the plate, you see a sudden drop in the
> plate voltage when the tube conducts to "push" the resonant circuit for
> another turn again, then this voltage recovers more or less exponentially
> due to the capacitive load on the plate.
> The BFO in a National HRO behaves the same.
> 
> 73, Jacques, VE2JFE
> 
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