Phase Splitter as input stage

[Sch3mat1c]

It appears that, loaded equally, they see the cathode's impedance. This makes sense because the "lever" is equal (that Kirchoff guy).

As I noted with the last experiment, at HF, even with extreme capacitive loading, balance is preserved.

Tim

 

[tubetvr]

It appears that, loaded equally, they see the cathode's impedance.

Not exactly, as SY wrote earlier the source impedance from both anode and cathode is:

The source resistance is Rr/([mu+2]R+r), where R is the load resistor value and r is the plate resistance.

Note that the source resistance is dependant on the load resistance.

As I noted with the last experiment, at HF, even with extreme capacitive loading, balance is preserved.

Yes, as long as the loads are equal balance is preserved, but for the normal case there is an imbalance at very high frequencies as the capacitances in the phase splitter tube itself are unequal for anode and cathode , (meaning the loads are unequal) but this only affects very high frequencies, (at several MHz).

Regards Hans