If they are not already.
They can give to newer generations the joy of listening to the world class quality of low power class A operating (electrons flowing all the time) power amplifiers.
Advantages are:
They can be directly connected to collector or drain of transistors, FETs or anode of electron tubes though this may be dangerous and all safety precautions should be observed. Connection can even be without an output transformer so the response of the power amplifier may go down to 0Hz.
The line is 600Ω so no thick cable is needed.
A high sensitivity hi Z speaker can sound relatively loud with just one small power transistor. For example the Pleiades 2N3053 power amplifier using just one 2N3053 bipolar transistor operating in class A and powered by only 12V at 6mA. And it is made of just 3 components including the transistor.
Another fun part is how smooth and dynamic such amplifiers sound.
Reference:
http://euroelectron.blogspot.gr/2018/03/madonnas-voice-coming-from-point-source.html
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