I want to look at vacuum tube boatanchor signals (mixer signals).
These are high impedance so I need some kind of input buffer I guess.
I thought about this because of the link to Hans's spectrum analyzer.? It has a high impedance input buffer:
It uses a MAX4178 which seems to be obsolete.? Do I want to find a substitute(any ideas)? or do some other kind of
impedance matching?? I have been able to see the signals on my tinySA? by using my 465 scope vertical output to buffer,
as well as using a FET input Bipolar output buffer I built.? I am wondering how much distortion I am getting
though.
73,
Gary
WB6OGD
