Current dumping amplifier schematics always looked strange to me. I am considering building one, just to try one out. Solid tantalum capacitors strike again.

In this example from Starič and Mangan’s book, "Wideband Amplifiers," pp 2.49-50, the three video components all have different input impedance, but the T-coils provide for them all.

This makes for a good buffer amplifier, with infinite impedance on the input and zero impedance on the output. Ideally, at least. Figure 3 The buffer amplifier provides infinite input impedance and ...

A conventional tube amplifier has a circuit whose fundamentals were well in place around a hundred years ago, so there are few surprises to be found in building one today. Nevertheless, building on… ...