[Elecraft] Receiver impedance?

[Walter Underwood]

What is a typical input impedance for modern receivers, or specifically Elecraft receivers? 

I’m asking because antenna tuners are a frequent question on an SWL group I follow and I’m pretty sure that they are not needed for most situations. If the receiver input impedance is not 50 Ω, that is a big data point.

My belief is that receivers are generally medium or high impedance, depending on whether the first RF preamp is bipolar or FET, but either way, mostly voltage-oriented.

And, yes, I know that antenna tuners can be a LPF or HPF, depending on their configuration.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)